2010 November 26 Friday
Aubrey de Grey Versus David Brin On Rejuvenation

At a site called I Look Forward To Aubrey de Grey offers a more optimistic view on the rate of advance for rejuvenation therapies.

I think we have a 50% chance of achieving medicine capable of getting people to 200 in the decade 2030-2040. Presuming we do indeed do that, the actual achievement of 200 will probably be in the decade 2140-2150 - it will be someone who was about 85-90 at the time that the relevant therapies were developed.

Aubrey's view of the 2030-2040 decade as being pivotal sounds plausible to me just because of all the activity in tissue engineering, with replacement trachea and bladders grown for humans for example. The future of replacement parts is no longer the distant science fiction future but, rather, the "most of us will live to see this" future.

By contrast, science fiction writer David Brin (whose StarTide Rising and Uplift War I recommend) sees the problems with rejuvenation as much harder to solve.

All advances to date have involved allowing ever-greater percentages of humanity to hit the "wall" at age 100, and maybe coast a few years beyond. Getting beyond that will require either;
1) THOROUGH nanotechnology, applied down at the INTRA-cellular level, or
2) genetic recoding to enhance repair capabilities in new ways (good news for our great grandchildren, maybe, or
3) gradual replacement of failing parts and systems with prosthetics, or 4) uploading.

I think Brin's placing too much emphasis on the hardest problems and missing out on the lower hanging fruit. In particular, for much of the body we will be able replace cells and organs. So the need to get into cells to do intra-cellular repair is avoided, or at least delayed.

But Brin is correct on one point: The need for intra-cellular repair of brain cells. The hardest part of rejuvenation is brain repair. But even in the brain there's quite a lot of potential for cell therapies and immune therapies. Aging brains need replacement cells for their vasculature. They also need immune cells that will go in and remove the extra-cellular junk. I do not believe either of those types of treatment require nanotechnology. They might buy our brains enough time for the nanotech to be developed.

Since I see brain repair as the toughest problem my biggest question about the feasibility of rejuvenation revolves around when and what we will be able to do for aged neurons in situ. Since the brain is so much harder to rejuvenate will we have rejuvenated bodies but senile minds? How much time can we buy our neurons with gene therapies or by giving them newer support cells? (e.g. new glial cells and new vascular cells)

For those of you not familiar with Aubrey de Grey watch a talk Aubrey gave on rejuvenation in the summer of 2009.

Also see Aubrey's interview with Stephen Colbert and my post about his book Ending Aging.

By Randall Parker    2010 November 26 05:44 PM   Entry Permalink | Comments (55)
2010 November 16 Tuesday
Will Perpetually Young Become Extremely Risk Averse?

Seth Shostak thinks perpetual youth is a recipe for stagnation and extreme cocooning where people stay home out of fear in virtual reality.

Regrettably, you might not find any groceries. Farming is one of the most dangerous jobs around, and any farmer who lives long enough to fear riding in a car has had a more-than-even chance of being killed in the back forty. Incidentally, that's about the same death rate as mining coal, so we'll need to get those wind turbines built if you want electricity at home.

Here's the problem in a nutshell: if we extend human lifetimes a lot -- to millennia, rather than centuries -- all the small risks you heedlessly take every day will have a devastating cumulative impact. Most jobs will become unattractive, because just about any occupation becomes, eventually, a deadly occupation. We'll automate nearly everything we can, and stay at home immersed in a virtual world.

First of all, he's missing just how much interaction and change will be possible using virtual worlds. Second, what's wrong with having robots do all the dangerous work? That seems like a feature, not a bug.

Third, I question the extent to which people will avoid risk-taking. Humans aren't that rational. Look at the risk-taking junkies now jumping out of airplanes, kayaking, snow boarding, and speeding around country roads. They find the prospect extreme thrills in risky endeavors extremely alluring. Absent some gene therapy to dampen their desire for risk I expect rejuvenation will make them more prone to take risks, not less. Who is more likely to do extreme skiing? Someone with a young body or an old body?

I've previously explored this issue in my posts Will Longer Lives Make People More Risk Averse? and Will Eternal Youthfulness Lead To Less Ambition?

By Randall Parker    2010 November 16 11:13 PM   Entry Permalink | Comments (9)
2009 August 11 Tuesday
Better To Treat Aging Than Individual Diseases

UC Irvine cell biologist Doug Wallace argues that we can not afford to treat the growing population of old folks by treating individual disease and that we should instead treat underlying causes as a cheaper and more effective alternative.

“There will never be enough money for the federal government to pay for the demands of health care, because of chronic age-related diseases,” said Doug Wallace, a cell biologist at the University of California, Irvine.

Wallace's argument overlaps a great deal with a similar argumeny by biogerontologist Aubrey de Grey that we should develop rejuvenation therapies. Aubrey believes that we can develop technologies to make the body younger and that by doing so we will drastically cut the incidence of all the diseases associated with old age. I agree.

Wallace researchers mitochondria. The mitochondria break down sugars to extract energy to run cells. Some researchers believe accumulated damage in mitochondrial DNA causes mitochondria to malfunction and aging cells to run low on energy. This low energy condition might cause many of the diseases of old age.

“There might be a totally different way of treating disease, in which you’re treating the body as a system,” said Wallace. “The idea is that you could have a treatment for Alzheimer’s disease that would also be good for cardiac disease, and that’s exactly what we find with mitochondrial medicine.”

We do not yet have the biotechnologies we need to reverse aging. However, Strategies for Engineered Negligible Senescence (SENS) provide a framework for what we need to develop.

By Randall Parker    2009 August 11 12:27 AM   Entry Permalink | Comments (17)
2009 March 17 Tuesday
Rejuvenation Therapies No Longer Distant Science Fiction

Vancouver Sun columnist Stephen Hume writes that rejuvenation maybe in reach and cites comments by familiar aging and longevity researchers.

Dr. Leonid Gavrilov, a Russian longevity researcher working at the University of Chicago, where he’s a director of the Centre of Aging, told The Independent that “replacing damaged organs to greatly extend the human lifespan by substituting young and healthy for old and failing is no longer science fiction.”

The 21st century is when science fiction will happen in reality.

The growth of replacement organs will eliminate many organ failures as causes of death - at least for anyone who can afford to pay for the replacements or get their government to pay. This is a 21st century prospect. When in the 21st century is harder to say. But the growth of human organs won't remain out of reach for the entire 21st century. My guess is we will see this start to happen in the late 2010s or maybe the 2020s at the latest.

But the ability to rejuvenate doesn't guarantee immortality. It just eliminates aging as a cause of death. Suicide, murder, and accidents will still cause eventual death.

Assorted advances helped cause substantial jumps in life expectancy in the late 1880s and beyond.

Between 1880 and 1900, life expectancy in the developed nations jumped by six years. Between 1900 and 1920, with the advent of blood transfusions, X-rays, immunizations for cholera and other diseases and better food preservatives, it jumped by another 7.4 years.

Between 1920 and 1940, with the discovery of insulin, vaccines for tuberculosis, tetanus, typhus and yellow fever and the first broad-spectrum antibiotic, penicillin, life expectancy again increased by 7.4 years.

Over the past century and a half, life spans have averaged an increase of just over 2.5 years every decade. If those scientists who say there appears to be no upper limit on age are correct, if trends in increasing life expectancy are sustained or accelerated by medical breakthroughs, then it certainly seems plausible to speculate that somebody alive today might indeed still be living in 2159.

What's going to be different about the next round of advances? The techniques used to develop new therapies will be qualitatively far more powerful than the tools and techniques used to develop previous generations of medical therapies. Biomedical scientists and bioengineers will manipulate genes and cells to rework human flesh into more youthful and healthful conditions. The next round of advances won't just kill pathogens, reduce toxin exposures, and provide better food. Therapies will intervene within cells to repair them and will provide replacement cells and organs.

Update: Leonid Gavrilov says he was misquoted by Hume. See Gavrilov's corrections here. I think Hume wasn't the original misquoter though. The Independent really does claim Gavrilov said this. Here's a relevant excerpt from The Independent in 2005:

Next month, a multidisciplinary group of academics, led by engineers, will celebrate the recent breakthroughs in stem-cell research at the second annual conference of SENS (Strategies for Engineered Negligible Senescence). "Replacing damaged organs to greatly extend the human life span by substituting young and healthy for old and failing is no longer science fiction. Laboratories around the world are making progress in building replacement lung, kidney, liver and heart tissue," says Dr Leonid Gavrilov, a leading member of SENS and director of the Center of Aging at the University of Chicago.

Dr Gavrilov describes a "eureka" moment while working as a geneticist in the former Soviet Union on "an unpredictable, dilapidated mainframe computer". Its complex behaviour was best understood, he suddenly realised, "by resorting to such human concepts as character, personality and change of mood, and this observation led to the bizarre idea that living organisms, including humans, resemble partially damaged machines rather than new ones".

Maybe Aubrey de Grey or another biogerontologist originally said it? Anyone know?

By Randall Parker    2009 March 17 11:27 PM   Entry Permalink | Comments (6)
2008 December 24 Wednesday
Aubrey de Grey Google Tech Talk On Defeat Of Aging

A friend points out that Aubrey de Grey's October 8, 2007 Google Tech Talk on the defeat of aging has only 402 views. That's a waste of a valuable talk on a very important topic. So here's a post to begin to remedy this waste:

Aubrey and Dave Gobel co-founded the Methuselah Foundation to accelerate the defeat of the aging process. Toward this goal Aubrey proposes Strategies for Engineered Negligible Senescence (SENS) to reverse the aging process and repair our bodies to save us from the ravages of aging.

If you are new to SENS and or just haven't heard a recent talk by Aubrey on this topic then watch his lecture.

By Randall Parker    2008 December 24 04:04 PM   Entry Permalink | Comments (9)
2008 May 26 Monday
If You Could Rejuvenate Three Parts Of Your Body

Suppose you find a lamp that contains a genie. Suppose the genie grants you 3 wishes to make parts of your body young again. You have to use the wishes by age 55 (before most old age diseases become apparent) or immediately if you are already over 50. The wishes are for only parts of the body. Each could make an organ (and the skin is an organ) or subsystem (e.g. immune cells or spine) young again. You couldn't wish your entire chest or entire leg be young again. But you could wish your heart or your muscles to return to youthfulness. Also, you could wish any other single organ (or pairs in the case of eyes, kidneys, or other organs that come in pairs or all the parathyroids that come in quadruplets) to be young again.

Okay, with these restrictions in mind what would you wish to make young again in your body?

A woman friend of mine would waste no time in wishing her skin young again. No sags, discolorations, wrinkles. But she'd be at least partially disappointed since the bones in her face and the rest of her body also age and shift around. Also, one would really need to rejuvenate fat cells as well in order to rejuvenate the face. Would you go for appearances? You could opt for younger skin, fat cells, and bones. This would yield benefits other than with appearances.

Some people will have an easy decision to make if they already have heart problems or perhaps failing kidneys or liver damaged by hepatitis C or alcohol. Imminent threats make prioritizing a much simpler task.

Before reading further have you made up your mind? Next I'll say what I would choose for my top rejuvenation wishes.

The first thing I'd go for is a totally rejuvenated vascular system. This would greatly reduce the risk of heart attack or stroke among other cardiovascular diseases. But it would also help the brain substantially by cutting back on brain microbleeds, probably reducing inflammation that leads to Alzheimer's disease, and reducing risk of dementia. My problem would be in deciding when to opt for the therapy. At 50? Or at 55? If I wait longer will I suffer from some otherwise avoidable brain damage? Or will I benefit more by protecting my body into a more distant future?

After the rejuvenated vascular system I would opt for a rejuvenated immune system. Why? Of course some old folks die from influenza and other diseases because their immune systems are too weak. But that is not my biggest reason. One of the most interesting research reports of the last year reported aging immune systems become less able to kill early stage cancer cells. If I could know exactly which organ I might get cancer I would opt to rejuvenate that organ. But since I can't know which organ poses the biggest threat the next best way to cut my cancer risk (short of total body rejuvenation) is to make my immune system young again and far more able to kill aberrant cells before they develop into a full cancer.

Notice how I'm not going for internal organ rejuvenation. That's because I do not know which internal organ of mine puts me at greatest risk. Now, maybe 5 or 10 years from now blood tests and biopsies of internal organs will provide us much longer warnings of which organ looks likely to fail first. In the future then I'd want to have up-to-date lab tests before using my wishes. Heck, given such wishes I would want to go for a full physical even with today's testing capabilities. But absent a firm idea on which organ will fail first my preferences lean toward the circulatory system and immune system.

My third choice is hardest. I could just guess on some internal organ like the heart or maybe the liver or prostate and say "give me a new one". Maybe it would make sense to look at a list of causes of death and choose the organ that rates highest in combined causes. For example, liver failure and liver cancer both kill.

But I'm strongly biased toward rejuvenating my brain. First off, doing so will boost my productivity. Second, I'll avoid the risk of assorted causes of dementia, especially when combined with vascular rejuvenation. Plus, the brain does a lot of chemical endocrine signaling to the rest of the body (e.g. from the hypothalamus). That signaling will be done better by a younger brain.

So what's your list? Got good reasons for rejuvenating one part of your body or another?

By Randall Parker    2008 May 26 11:10 PM   Entry Permalink | Comments (38)
2008 February 11 Monday
Aubrey de Grey On Colbert Report

Dave Gobel tells me Aubrey de Grey (he of Strategies for Engineered Negligible Senescence fame on how to make our bodies youthful again) will be on the Colbert Report tonight. For those with access to the Comedy Central channel check it out. Steve Colbert should find some new humorous angles on living young for many centuries.

By Randall Parker    2008 February 11 07:15 PM   Entry Permalink | Comments (9)
2007 October 31 Wednesday
Aubrey de Grey Wants To Cure Aging

Biogerentology theorist Aubrey de Grey is co-author of a new book arguing we can defeat aging Ending Aging: The Rejuvenation Breakthroughs That Could Reverse Human Aging In Our Lifetime. Aubrey is also the focus of an article by Joel Garreau in the Washington Post: The Invincible Man: Aubrey de Grey, 44 Going on 1,000, Wants Out of Old Age

Aubrey David Nicholas Jasper de Grey, 44, recently of Britain's Cambridge University, advocates not myth but "strategies for engineering negligible senescence," or SENS. It means curing aging.

With adequate funding, de Grey thinks scientists may, within a decade, triple the remaining life span of late-middle-age mice. The day this announcement is made, he believes, the news will hit people like a brick as they realize that their cells could be next. He speculates people will start abandoning risky jobs, such as being police officers, or soldiers.

Aubrey believes (and FuturePundit agrees) that we can develop biotechnologies that will allow us to reverse aging and make us young again. This goal will be achieved within the lifetimes of at least some of the people currently alive. The sooner the general public realizes this the faster this goal will be realized.

Aubrey is attracting large donations toward the goal of reversing aging.

De Grey's original academic field is computer science and artificial intelligence. He has become the darling of some Silicon Valley entrepreneurs who think changing the world is all in a day's work. Peter Thiel, the co-founder and former CEO of PayPal -- who sold it in 2002 for $1.5 billion, pocketing $55 million himself -- has dropped $3.5 million on de Grey's Methuselah Foundation.

"I thought he had this rare combination -- a serious thinker who had enough courage to break with the crowd," Thiel says. "A lot of people who are not conventional are not serious. But the real breakthroughs in science are made by serious thinkers who are willing to work on research areas that people think are too controversial or too implausible."

Aubrey thinks once aging is conquered we will periodically retire and retool for different occupations.

"Another thing that's going to have to change completely is retirement. For the moment, when you retire, you retire forever. We're sorry for old people because they're going downhill. There will be no real moral or sociological requirement to do that. Sure, there is going to be a need for Social Security as a safety net just as there is now. But retirement will be a periodic thing. You'll be a journalist for 40 years or whatever and then you'll be sick of it and you'll retire on your savings or on a state pension, depending on what the system is. So after 20 years, golf will have lost its novelty value, and you'll want to do something else with your life. You'll get more retraining and education, and go and be a rock star for 40 years, and then retire again and so on."

Aubrey thinks people are heavily invested in believing that death from aging is inevitable. This position made sense back when death from aging really was inevitable. Best to rationalize that aging is a good thing if there's nothing you can do about it. Make your peace and find reasons to be happy with what you can't change. But the rate of advance of biotechnology is accelerating with DNA sequencers and microfluidic devices becoming more powerful in ways analogous to the rate of progress with computers. We can strive for goals that used to seem unattainable. We should start trying to conquer aging. It is a solvable problem.

By Randall Parker    2007 October 31 10:46 PM   Entry Permalink | Comments (27)
2007 September 23 Sunday
Aubrey de Grey: Ending Aging - First Part Review

Biogerontologist Aubrey de Grey and assistant Michael Rae have a new book out on how aging can be stopped and reversed entitled Ending Aging: The Rejuvenation Breakthroughs That Could Reverse Human Aging In Our Lifetime. I'm only on page 18 but it is pretty good so far. I'm going to write a series of posts about it as I read through the book.

In chapter 2 Aubrey discusses why people accept aging as inevitable and for the most part resist hearing arguments for why aging is defeatable.

There is a very simple reason why so many people defend aging so strongly - a reason that is now invalid, but until quite recently was entirely reasonable. Until recently, no one has had any coherent idea how to defeat aging, so it has been effectively inevitable. And when one is faced with a fate that is as ghastly as aging and about which one can do absolutely nothing, either for oneself or even for others, it makes perfect psychological sense to put it out of one's mind - to make one's peace with it, you might say - rather than to spend one's miserably short life preoccupied by it. The fact that, in order to sustain this state of mind, one has to abandon all semblance of rationality on the subject - and, inevitably, to engage in embarrassingly unreasonable conversational tactics to shore up that irrationality - is a small price to pay.

Most of us do need peace of mind. But watching people decay from aging does not give me peace of mind. Just how much aging causes pain and suffering is not something that most people appreciate. Do you know people who have daily pain from osteoarthritis? I do. Since friends know I follow things medical and biological I get requests from friends to look up on the internet info about side effects of pain killers and the like. Start taking note of people around you who use pain killers. You might be surprised at what you tally up.

Then there are the various infirmities and disablements. Know men who can't go far between toilet stops? Women who wake in the middle of the night from hot flashes that last for years? How about decaying eyes that need more kinds of corrective glasses for more reasons? The list goes on. Walk through a store and you'll see lots of people with lots of infirmities. The older they look the more problems you should suspect they have.

Some people say that aging is a graceful process that has dignity. Ever helped a person or a dog die from cancer? I've done both. Nothing graceful about it. Not dignified about it. I hate to recall the images of what I saw.

Aubrey calls on us to wake up out of our "aging is inevitable" trance. I'm hearing a variation on John Lennon in my mind: "Imagine there's no aging, It's easy if you try".

I've told you that we've recently reached the point where we can engage in the rational design of therapies to defeat aging: most of the rest of this book is an account of my favored approach to that design. But in order to ensure that you can read that account with an open mind, I need to dispose beforehand of a particularly insidious aspect of the pro-aging trance: the fact that most people already know, in their heart of hearts, that there is a possibility that aging will eventually be defeated.

Why is this a problem? Indeed, at first sight you might think that it would make my job easier, since surely it means that the pro-aging trance is not particularly deep. Unfortunately, however, self-sustained delusions don't work like that. Just as it's rational to be irrational about the desirability of aging in order to make your peace with it, it's also rational to be irrational about the feasibility of defeating aging while the chance of defeating it any time soon remains low. If you think there's even a 1 percent chance of defeating aging within your lifetime (or within the lifetime of someone you love), that sliver of hope will prey on your mind and keep your pro-aging trance uncomfortably fragile, however hard you've worked to convince yourself that aging is actually not such a bad thing after all. If you're completely convinced that aging is immutable, by contrast, you can sleep more soundly.

Aubrey argues that the chance of defeating aging within our lifetimes is a lot higher than 1% and on that I agree. Scientists are making advances in development of the tools we'll need to defeat aging. Impressive results are getting reported on stem cell therapies, growth of replacement organs in labs, and other pieces of the puzzle. We are looking at a scale of time that is on the order of decades, not centuries.

Anyway, the book is a good read so far. I recommend it.

By Randall Parker    2007 September 23 09:05 AM   Entry Permalink | Comments (4)
2007 April 29 Sunday
Aubrey de Grey: We Should View Aging As Curable

Reason at Longevity Meme points to a new paper by biogerontologist Aubrey de Grey where Aubrey argues that biogerontology's ultimate goal should be the defeat of processes which cause aging. We should view aging as ultimately curable just as cancer researchers view cancer as ultimately curable.

An interesting position paper from Aubrey de Grey via the Annals of the NYAS: "The early days of biogerontology were blessed with an undiluted forthrightness concerning the field's ultimate goals, epitomized by its leaders. Luminaries from Pearl to Comfort to Strehler declared the desirability of eliminating aging with no more diffidence than that with which today's oncologists aver that they seek a cure for cancer. The field's subsequent retreat from this position garnered a modicum of political acceptability and public financial support, but all biogerontologists agree that this fell, and continues to fall, vastly short of the funding that the prospect of even a modest postponement of aging would logically justify. "

Aubrey goes on to point out that the last 20 years of advances in genetic manipulations that extended life of model organisms make the prospect of reversing aging a lot easier to imagine as doable. I would go further and argue that the general advance in biotechnology, with the continuing development of much more powerful tools to measure and manipulate biological systems at the molecular level, makes the idea of rejuvenation seem much more attainable.

The nature of general line of advance in biotechnology (e.g. in microfluidics and in nanotechnology) should lead us to expect orders of magnitude more powerful tools in a couple of decades. Just as the shrinking size computer technology allows computer chips, hard drives, fiber optics, and transceivers to go through long series of doublings in capability so does the miniaturized level at which biological instrumentation advances.

Why shouldn't we treat aging as curable? The amazing physicist Richard Feynman gave a speech in 1959 entitled There is plenty of room at the bottom where he argued that we can develop the ability to manipulate matter at the molecular level. A continuing trend in technology since that speech has been the development of tools to better measure and manipulate increasingly smaller amounts of material. That trend made possible the sequencing of whole genomes and will eventually make possible sequencing of each person's genome for a very low cost. That trend is also going to lead to technology that allows us to make nanodevices that can repair human tissue at the level of individual cells and molecules.

Given this miniaturization trend and how far Feynman thought it can go I do not see why rejuvenation therapies are either impossible or a distant prospect. For many parts of our bodies we will develop the means to grow replacement parts. For other parts we will develop the means to send in stem cells to replace lost cells. For still other parts we will develop the ability to repair individual cells using gene therapy, nanodevices, and other methods. We need to start looking at aging as curable and start demanding bigger efforts to develop the cures.

By Randall Parker    2007 April 29 04:00 PM   Entry Permalink | Comments (46)
2006 September 18 Monday
PayPal Co-Founder Donates To Reverse Aging

Good news. Big money is starting to support research to conquer aging and make us young again.

Peter A. Thiel, co-founder and former CEO of online payments system PayPal, and Founder and Managing Member of Clarium Capital Management, a San Francisco-based hedge fund, today announced his pledge of $3.5 Million to support scientific research into the alleviation and eventual reversal of the debilities caused by aging, to be conducted under the auspices of the Methuselah Foundation, a charity co-founded and Chaired by Dr. Aubrey de Grey.

Mr. Thiel commented, "Rapid advances in biological science foretell of a treasure trove of discoveries this century, including dramatically improved health and longevity for all. I'm backing Dr. de Grey, because I believe that his revolutionary approach to aging research will accelerate this process, allowing many people alive today to enjoy radically longer and healthier lives for themselves and their loved ones."

Mr. Thiel will donate a total of $500,000 over the next three years to fund pilot research projects intended to deliver early stage validation of the "SENS" approach to combating the debilitation caused by aging.

Additionally, from now until the end of 2009, Mr. Thiel promises to match every Dollar donated to the Methuselah Foundation for SENS research with a 50 cent matching contribution from himself, up to a maximum of $3 Million of matching funds.

Dr. de Grey said, "I am extremely grateful to Peter for his bold and visionary initiative. I have been working with leading biologists and biochemists around the world in identifying promising research projects, and with this generous donation we will go to work straightaway."

SENS (Strategies for Engineered Negligible Senescence) is a set of approaches to repair the body and reverse the aging process to make bodies fully young again. Click through on one of the SENS links and read all about it if the term is new to you.

I expect Thiel's donations to be the first of many very large donations aimed at reversing the aging process. The large number of multi-millionaires are very sharp people who know they really can't take their money with them when they die. So why not use a piece of their wealth to take a stab at making their bodies young again?

The full reversal of the aging process is an achievable goal. We will develop the biotechnologies to grow replacement parts, to do gene therapy, to send in stem cells to do repairs, and to remove the junk that accumulates in cells and between cells as we age. Daily announcements from biological resesarch labs demonstrate progress toward many of the technologies needed to reverse the aging process. Some people who are alive today will live to see the conquest of aging and the end of death from old age.

By Randall Parker    2006 September 18 11:11 PM   Entry Permalink | Comments (17)
2006 April 30 Sunday
Financial Experts Debate Implications Of Aging Population

Businessweek has a debate between a couple of finance experts on the financial implications of an aging population. University of Pennsylvania Wharton business school finance professor Jeremy Siegel sees everyone working longer.

The age wave is the most severe in Japan. By mid century, 75 to 80 will be most populous age group there, and the number of workers per retiree will fall to one-to-one. The big questions facing the developed world are, who's going produce the goods, and who's going buy the assets. If there are not enough workers earning income, then there aren't enough buyers of all the stocks and bonds that are going be sold. It's the flip side of same question.

I built a model to show how much longer Americans will have to work because of the coming shortage of workers. Life expectancy will continue to rise. But the retirement age will rise substantially more, I believe, from 62 today to 73 or 74 in the future. Of course, some say it will rise just because people live longer. But it has to rise more than that. The age Americans spend in retirement will shrink from 14.4 years today to 9.2 by mid century.

I certainly agree that retirement ages must rise. Western nations should start raising retirement ages now. We need to move toward eligibility for state-funded retirement programs based on physical and mental inability. Healthy people should work unless they save enough to retire.

Junk bond king Michael Milliken sees a rosier future where biotechnogical advances that lead to slower aging will translate into higher economic output and better lives.

In 1974, it cost $100 million to sequence a gene. Today, it cost $3, and by 2013, it will be 3 cents.

We also constantly underestimate life expectancy. In Japan today, the quality of life lasts longer than anywhere else. They have 73.6 healthy years before becoming disabled (by old age), vs. 67.6 in the U.S. But even in the U.S. there have been big gains. The share of men in poor or fair health has gone from where it was at age 60 20 years ago to age 72 today. That's 12 years of increased quality of life. In 1970, a 59-year-old man had the same probability of dying as a 65-year-old today. The same is true with women. We're living longer and more productive lives.

I think all the conventional ways to project future increases in life expectancy are greatly underestimating the effects of coming advances in biotechnology. Our knowledge is not simply increasing with the same fixed amount of knowledge added to the sum total of our knowledge every year. Rather, the rate at which we can collect knowledge is increasing. That trend looks set to continue for decades to come.

Look at Milliken's example of the dropping cost of DNA sequencing. Orders of magnitude increases in capabilities in biotechnology mirror the orders of magnitude increases that happen in electronics technology. The advances in semiconductors for manipulating things at very small scales that drive the rapid advances for electronics are also enabling the construction of devices for biotechnology such as DNA gate arrays and microfluidics devices. The electronics revolution is being repeated in biotechnology.

Just as the discovery of antibiotics made many infectious diseases suddenly curable the same will happen with diseases of aging. Got a bad heart? Grow a new one or send gene therapy in to instruct your cells in how to repair themselves. Bad liver or bad kidneys? Again, grow replacements or fix them. All the problems that must be solved to reach that point are solvable. Therefore we will solve them.

People who do not see this biotechnological revolution in rejuvenation on the horizon are akin to someone in 1965 saying that of course computers must take up whole rooms and that we'll never have desktop computers which are many orders of magnitude faster than 1965 mainframes. We are going to gain the ability to manipulate cells and genes on a level that will allow us to repair our aged bodies. There's nothing about the nature of physical reality that precludes our developing the ability to do this.

If you want to learn about how human aging will become curable and whole body rejuvenation will become possible read about Aubrey de Grey's Strategies for Engineered Negligible Senescence.

By Randall Parker    2006 April 30 10:21 AM   Entry Permalink | Comments (2)
2006 March 11 Saturday
Aubrey de Grey Sees War On Aging Starting In 10 Years

Biogerontologist Aubrey de Grey says the highly goal directed engineering effort which he calls the coming "War On Aging" will begin in about 10 years.

Aubrey de Grey of Cambridge University, UK, has presented a cure for aging - Strategies for Engineered Negligible Senescence. The plan's focus is not to interfere with a person's metabolism, but to repair damage to the body over time, at the cellular level, rather than dealing with the aging process in its later stages.

"My point here is just that this is goal-directed rather than curiosity-driven," de Grey said. "I view medicine as a branch of engineering."

...

De Grey calls the time during which the technologies will experience the most development the War On Aging.

"I use the phrase to describe the period starting when we get results in the laboratory with mice that are impressive enough to make people realize that life extension is possible, and ending when the first effective therapies for humans are developed," de Grey said. "I estimate that the War On Aging will start 10 years from now, subject to funding of research, and will last for 15 years, but this latter estimate is extremely speculative."

When he refers to a point when the War On Aging ends my guess is that he's referring to the point where we have achieved the ability to extend life faster than the rate at which calendar clock time advances. From an article of his published in PLoS Biology Aubrey says if we can extend life expectancy in a year by more than a year's time then Aubrey calls that point "actuarial escape velocity" which is the point at which we can repair aging damage faster than it accumulates.

...that in which mortality rates fall so fast that people's remaining (not merely total) life expectancy increases with time. Is this unimaginably fast? Not at all: it is simply the ratio of the mortality rates at consecutive ages (in the same year) in the age range where most people die, which is only about 10% per year. I term this rate of reduction of age-specific mortality risk ‘actuarial escape velocity’ (AEV), because an individual's remaining life expectancy is affected by aging and by improvements in life-extending therapy in a way qualitatively very similar to how the remaining life expectancy of someone jumping off a cliff is affected by, respectively, gravity and upward jet propulsion (Figure 1).

The escape velocity cusp is closer than you might guess. Since we are already so long lived, even a 30% increase in healthy life span will give the first beneficiaries of rejuvenation therapies another 20 years—an eternity in science—to benefit from second-generation therapies that would give another 30%, and so on ad infinitum. Thus, if first-generation rejuvenation therapies were universally available and this progress in developing rejuvenation therapy could be indefinitely maintained, these advances would put us beyond AEV.

How can this be accomplished? Read about Aubrey's Strategies for Engineered Negligible Senescence (SENS) for achieving this goal. Also, Aubrey and Dave Gobel founded the Methuselah Mouse Prize to encourage scientists to extend the lives of laboratory mice.

The prize seeks to encourage development of technologies that will also extend human lives. But its most important effect will be in terms of how those advances come to be viewed by the general public. The sooner scientists extend the lives of lab animals the sooner the public will wake up to the feasibility of radically extending human lives. This realization on the part of the public will eventually lead to widespread public demand for the War On Aging. Anyone who donates to the Methuselah Mouse Prize is helping to make the War On Aging begin in earnest sooner rather than later. Anyone who promotes the message that ‘actuarial escape velocity’ (AEV) is achievable via SENS technologies within the lifetimes of most of the people alive today also is effectively arguing for the coming War On Aging.

Stop being a pacifist where death is concerned. Join the supporters of the War On Aging. Time to go into battle against the Grim Reaper.

Update: Jay Olshansky, Daniel Perry, Richard A. Miller, and Robert N. Butler, arguing for a more modest goal of decelerating the rate of aging say that the future costs of an aging population will increase so much that the costs of an accelerated pace of aging research are easy to justify in terms of potential future costs avoided.

Consider what is likely to happen if we don't. Take, for instance, the impact of just one age-related disorder, Alzheimer disease (AD). For no other reason than the inevitable shifting demographics, the number of Americans stricken with AD will rise from 4 million today to as many as 16 million by midcentury.4 This means that more people in the United States will have AD by 2050 than the entire current population of the Netherlands. Globally, AD prevalence is expected to rise to 45 million by 2050, with three of every four patients with AD living in a developing nation.5 The US economic toll is currently $80-$100 billion, but by 2050 more than $1 trillion will be spent annually on AD and related dementias. The impact of this single disease will be catastrophic, and this is just one example.

$1 trillion per year in future costs for Alzheimer's alone demonstrate the scale of the potential savings that could come from therapies to decelerate and even reverse aging. Already today's cost of diseases run into the trillions in health care costs plus additional even higher costs of lost productivity and strains on families and friends who help out the sick and invalid. Our spending on anti-aging research should be in the hundreds of billions of dollars per year.

By Randall Parker    2006 March 11 01:39 PM   Entry Permalink | Comments (45)
2005 October 10 Monday
Chronic Disease Biggest Killer World Wide

Chronic diseases will kill 35 million in 2005.

By the end of 2005, twice as many people will have died from chronic diseases as from all infectious diseases, starvation and pregnancy and birth complications combined, international experts have warned.

The “neglected epidemic” of chronic disease will take 35 million lives in 2005, out of the total 58 million who will die globally. And contrary to popular belief, most of the deaths - 80% - from chronic conditions such as heart disease, diabetes and cancer will be in low to middle-income countries.

Obesity and the demon tobacco are big contributors to ths trend. But, while the article does not state this, this is really a success story in one sense: More people in less developed countries are living long enough to get diseases of old age.

Deaths from infectious diseases and starvation continue to be viewed by most people as morally more objectionable. Death from heart disease, cancer, and other diseases associated with aging continue to be seen as natural and inevitable. This view that these diseases are natural leads to the view that they are not morally undesirable. Whereas deaths from infectious diseases are seen as morally repugnant and to be fought against much more strongly.

As more diseases of old age become manipulable by biotechnology this belief in their naturalness and in their inevitability will wane. If more people could make that mental shift sooner then the result would be much greater political support for increased funding of research aimed at developing rejuvenation therapies.

By Randall Parker    2005 October 10 12:44 PM   Entry Permalink | Comments (4)
2005 August 22 Monday
Biomedical Research Seen As Capital Expenditure

Real estate investment banker Robert Klein, who initiated and providing funding for California's $3 billion Stem Cell Research and Cures Initiative which won 59% of the vote in a statewide referendum, argues that medical research costs should be seen more like an investment and less like an expense.

To Klein, medical research should be viewed as a part of the public infrastructure, like a dam or a bridge. "You've got to stop 'expensing' research," he says. "You've got to put it in the state constitution and authorize state bonds for it as a capital asset." The approach protects controversial areas of study and allows the state to account for costs over decades instead of every year. With this philosophy, Klein proposed a way for citizens to demand long-term funding. For nine months he worked with scientists, patient advocates and a team of prominent lawyers, and they eventually crafted Proposition 71 for the 2004 ballot.

Think of it this way: If potholes in the roads were causing damages to vehicles that far exceeded the cost of fixing the potholes then the political cry would go out to fix the potholes. Well, the cost of diseases and aging - both for expensive treatments and for the costs of disability - run into the trillions of dollars per year. So why do the US National Institutes of Health get less than $30 billion dollars per year while US federal, state, and local governments spend somewhere in the neighborhood of $700 to $800 billion per year for medical care and nursing care? Why does the private sector spend even more while the government also spends money to provide income to old folks who are too aged to work?

While we can not allocate money to repair and rejuvenate bodies as quickly as potholes can get repaired we can allocate money to achieve repairability of human bodies within the lifetimes of most of us. The idea of developing the means to grow replacement organs or send in cells or gene therapy to do repairs of tissue is no longer the distant imagining of science fiction. Such therapies are already available for a few diseases and more are under development. For example, two teams in Pittsburgh Pennsylvania and Innsbruck Austria have working cell therapies for repairing sphincter muscles to cure urinary incontinence.

The faster we develop therapies built upon the rapid advances in biotechnology the sooner we will start reaping the return on our collective investments in therapies that repair and rejuvenate aged, malfunctioning, and diseased body parts.

In 2003 health care spending made up 15.3% of the US economy and is projected to rise to 18.4% by 2013 with further increases beyond 2013. Currently US federal biomedical research spending (almost $29 billion out of an almost $11 trillion economy) amounts to less than a third of a percent of GDP. Why spend over 30 dollars delivering care with today's lousy treatments for every dollar spent on research to develop newer, better, and more cost effective treatments? Imagine we spent $30 dollars on car repairs for potholes for every dollar we spent fixing potholes. Our current policies are about that dumb. Effective treatments will be cheaper treatments. Also, effective treatments will boost productivity and economic output by boosting the level of function of the labor force and by allowing people to work more years. Biomedical research will pay back many times over.

My modest proposal: Fix medical research spending levels as a fixed percentage of major medical entitlements spending programs. For example, make Medicare and Medicaid each spend 10% or even 15% of their budgets on biomedical research. When their entitlements spending for provision of care goes up then their funding of research should go up in tandem by proportionate amounts. A 10% allocation of medical entitlements program spending to research would more than double current biomedical research funding. If the same pattern was repeated by other Western governments the increase in biomedical funding would greatly accelerate the rate of progress in developing therapies.

By Randall Parker    2005 August 22 01:37 PM   Entry Permalink | Comments (29)
2005 July 05 Tuesday
Aubrey de Grey: Stop Feeling Ashamed Of Goal Of Rejuvenation

Writing in the European Molecular Biology Organisation's journal EMBO Reports Cambridge UK biogerontologist Aubrey de Grey makes the case for pursuing complete human rejuvenation as an achievable and desirable goal in an article entitled "Resistance to debate on how to postpone ageing is delaying progress and costing lives".

Before moving on to discuss the second, widely overlooked, source of political resistance to funding ageing research, we can already note how the traditional gerontological rhetoric has become an albatross—and perhaps always was. "Ageing is not a disease", as I noted earlier, has long been a slogan of gerontology. Politicians may be inclined to feel that, well, if ageing is not a disease, it is probably not something we ought to be spending much effort combating, then, is it? When we reflect that this is a gut feeling that most people, and thus most politicians, probably have at the outset—what Miller (2002) termed "gerontologiphobia"—and also that when money is tight its allocators seek excuses to narrow the list of candidate recipients, we see clearly that describing ageing as "not a disease" has severe rhetorical drawbacks, regardless of the value it may once have had in distinguishing biogerontology from other biomedical research.

This problem is in my view dwarfed, however, by the second difficulty that politicians may have in embracing biogerontologists' arguments: the merit of spending money in pursuit of a given goal depends not only on that goal's desirability but also on its feasibility. Those of us who do not suffer from gerontologiphobia are persistently awed by the logical contortions that gerontologiphobes perform when asked to justify their pro-ageing stance. Similar awe—although that might not be the word they would use—may be felt by politicians who encounter the efforts of gerontologists to extract from available data an argument that their work will probably cause substantial compression of morbidity in the foreseeable future.

Although the concept is much older, the term 'compression of morbidity' was introduced by James Fries in a paper published in 1980: "Present data allow calculation of the ideal average life span, approximately 85 years. Chronic illness may presumably be postponed by changes in life style [...] Thus, the average age at first infirmity can be raised, thereby making the morbidity curve more rectangular. Extension of adult vigor far into a fixed life span compresses the period of senescence near the end of life" (Fries, 1980). Even ignoring the questionable assumption of a fixed lifespan, we immediately see that Fries is not predicting that combating ageing will compress morbidity. Instead, he stresses "changes in life style"—not a noted sphere of biogerontological influence. Fries's hope that US morbidity would be compressed has been realized in the meantime, and the details of that change duly support the theory that lifestyle, rather than biomedical progress, is responsible. All the compression observed is in mild to moderate disability, which is substantially achievable by lifestyle changes, whereas absolutely no compression of severe morbidity has occurred (Fries, 2003).

Aubrey thinks many biogerontologists entered the field when there was little hope of ever stopping or reversing aging. Therefore most entered to satisfy their curiosity rather than to achieve goals which have practical uses.

I suspect that, in their heart of hearts, many of my colleagues in biogerontology secretly realize or at least fear the futility of compressing morbidity by manipulating ageing. These people face an unenviable problem: they are scientists trapped in a biomedical discipline, so their path of least resistance may be to submit to the gerontologiphobia of society and not rock the boat. I should explain what I mean by this. When many of today's senior biogerontologists entered the field, serious postponement of ageing was not realistic, and they therefore became biogerontologists partly—and in most cases, I believe, mainly—with the curiosity-driven motivations of a basic scientist rather than the goal-directed ones of an engineer or clinician. They find discovery fulfilling, and seek only the resources to carry on discovering more. Any talk of actually doing something about ageing is then a Fig leaf—the sort of camouflage that all scientists use to make society value their work without fretting that there is no guarantee that it will ever be useful. Perhaps this is why those who propound the most blatantly invalid reasons why our hitherto minimal rate of progress in postponing ageing cannot be accelerated—reasons transparently based on misuse of logic (Hayflick, 2004) or of extrapolation (Olshansky et al, 2001)—are often allowed to carry on espousing their views without challenge. There may be a tacit hope that the blinding unjustifiability of their pessimism will distract the attention of the funding bodies from the subtler contradictions in what mainstream gerontology is saying to justify its existence.

But we no longer live in that era when rejuvenation was absolutely out of the question. Biotechnology has come so far that genomes can be sequenced at increasingly faster speeds and for declining costs. Technologies developed for the semiconductor industry are being adapted to make microfluidic devices which allow increasingly precise and cheap manipulation of biological systems down at the scale of cells and molecules. Computers allow automation and scaling of processes which required enormous quantities of manual labor in past decades.

The accumulation of tools for biological science and biotechnology is enabling more ambitious undertakings. Many scientists are already attempting to develop treatments that effectively reverse some processes of aging. Scientists working today will find ways to, for example, grow replacement organs and to send stem cells into the body to do repairs. Freshly grown replacement organs and other freshly grown body parts will entirely reverse the age of whatever parts of the body they replace. Immunotherapies to remove extracellular junk have been tested in animals and humans and continue to be developed.

Today scientists are working on parts of the rejuvenation puzzle. Most do so in order to treat specific diseases which are the result of aging (e.g. heart disease, kidney failure) rather than as part of a systematic attempt to roll back all of the causes of aging. Their work is still very valuable. But the lack of widespread embrace of the larger goal of full rejuvenation inevitably means that little effort goes into some of the therapies needed for full rejuvenation. Unless the goal of full rejuvenation becomes the goal of biogerontology the gaps in the current efforts will go unaddressed for years to come.

Aubrey argues that the many different diseases associated with aging could be more effectively treated by rejuvenating the body rather than attack each disease. This idea can be grasped by looking at just a single organ, the liver for example. The liver can fail due to many reasons (e.g. a variety of pathogens, alcohol, trauma from an accident, genetic defects, environmental toxins, cancer, and still other diseases). Treatments can be developed for each disease and many labs are working on all these causes of liver failure. But a replacement liver will fix just about all of them. Even if the pathogens that cause liver damage can not be removed when a liver is replaced the pathogens take decades to destroy the liver. So a replacement liver would buy additional decades of life during which to find a cure for the pathogens. For cancer discovered at an early stage before metastasis a replacement liver would even effectively cure liver cancer.

Aubrey says we should not feel ashamed to declare the defeat of aging as a worthy and achievable goal.

Just as the purpose of oncology is to defeat cancer, the purpose of biogerontology is, and should be declared to be, to defeat ageing. Vintage cars do not age, because their owners have the dedication and expertise to give them the necessary maintenance. We will in due course have the expertise to maintain ourselves with similar fidelity, and few can doubt that we will then also have the dedication. Hastening that advance, therefore, is a legitimate and honourable goal of which we have been ashamed for too long.

I agree. The desire to live is not dishonorable. The desire for youthfulness is not decadent. We should pursue the goal of full rejuvenation and defeat all human diseases in the process.

Also see Reason's coverage of Aubrey's article.

By Randall Parker    2005 July 05 10:41 AM   Entry Permalink | Comments (16)
2004 July 08 Thursday
Is Aging A Medical Condition?

A UC Irvine scientist claims aging is not a medical condition.

James McGaugh, director of the Center for the Neurobiology of Learning and Memory at the University of California-Irvine, bristles at the notion of people with normal brains taking medication to boost their brainpower. After all, he says, no one regards the slowing down of the body with age as a medical condition.

I disagree! So do many others. Aging is a medical condition because an aged body does not function properly. A body that does not function properly has a disease. A disease is a medical condition.

(Related story: 'Smart pills' make headway)

"Does Michael Jordan have age-related physical impairment?" McGaugh asks.

Yes, of course he does. Jordan's problem with his knees is obviously age-related. His general slowing down and less endurance are age-related. It is not a coincidence that as the years passed and his body aged he became impaired as compared to what he used to be able to do.

Just as Jordan may not be as agile on the basketball court as he used to be, McGaugh says, there's strong evidence that memory processing slows with age.

Yes, our brains age. The aging of our brains is a medical condition. Consider this recent report on gene expression, brain aging, and damaged genes.

To investigate age-associated molecular changes in the human brain, Dr. Bruce A. Yankner, professor in the Department of Neurology and Division of Neuroscience at Children's Hospital Boston and Harvard Medical School, and colleagues examined patterns of gene expression in postmortem samples collected from thirty individuals ranging in age from 26 to 106 years. Using a sophisticated screening technique called transcriptional profiling that evaluates thousands of genes at a time, the researchers identified two groups of genes with significantly altered expression levels in the brains of older individuals. A gene's expression level is an indicator of whether or not the gene is functioning properly.

"We found that genes that play a role in learning and memory were among those most significantly reduced in the aging human cortex," said Yankner. "These include genes that are required for communication between neurons."

In addition to a reduction in genes important for cognitive function, there was an elevated expression of genes that are associated with stress and repair mechanisms and genes linked to inflammation and immune responses. This is evidence that pathological events may be occurring in the aging brain, possibly related to gene damage.

The researchers then went on to show that many of the genes with altered expression in the brain were badly damaged and could not function properly. They showed that these genes also could be selectively damaged in brain cells grown in the laboratory, thereby mimicking some of the changes of the aging brain.

Is gene damage a medical condition? More generally, is brain damage a medical condition? Yes, of course. If you have something in your body that is damaged then you have a medical condition.

I am amazed to see scientists promoting a naturalistic fallacy that if some process is natural it must be normal and must not be treated. Imagine making that argument about, say, a troubled pregnancy: "Sorry maam, we can't intervene to save you or your baby from preeclampsia because in our view your illness is a natural result of an interaction between your genes and your environment." Or imagine saying this about a bacterial infection: "We can't give your daughter an antibiotic to kill the Group A streptococcal infections that is causing scarlet fever because infections are natural and have been happening for all of human history. So she'll just have to die since there is no medical condition here." You'd be thought either crazy or incredibly unethical if you said such things. But today too many scientists, doctors, and members of the public at large think of aging as an inevitability to be embraced as part of the natural order. Well, aging is not inevitable. It is one big medical condition that we need to cure. Aging reversal will some day become possible and we ought to be trying much harder to make that day come as soon as possible.

By Randall Parker    2004 July 08 10:55 AM   Entry Permalink | Comments (26)
2004 January 16 Friday
Will Eternal Youthfulness Lead To Less Ambition?

In a post entitled "Would potential immortals be risk-averse?" Tyler Cowen of Marginal Revolution also explores the question of whether long-lived people will be less ambitious.

A related question is whether immortals would be less ambitious, since they might always feel they could accomplish their goals in a more distant future. As long as we are citing fiction, I recall seeing a television show about immortal beings. They were content to remain homeless and spent most of their time sitting around a campfire and talking. They accumulated few possessions. They never feared such a course of action would lead to death, and they always held the option of trying to do more.

In my own post on this topic "Will Longer Lives Make People More Risk Averse?" I explored the question of whether the development of medical treatments that will offer eternal youthfulness will cause people to become extremely risk averse. Aubrey de Grey thinks people will go so far as to stop flying in airplanes and even stop driving cars. I don't think this will happen for reasons very similar to why young people do dangerous things even though they have many decades to live: a lot of people are bored and want to get their kicks. Many (though by no means all) people are biologically wired to be strongly motivated to desire experience of intense and dangerous thrills. Plus, human brains are not wired to accurately measure risks and therefore some people are bound to do things that are more dangerous than they believe to be the case.

One factor tends to argue against the idea that eternal youthfulness will lead to low ambition: A young mind and body is an energetic mind and body. An energetic mind and body will find ambitious undertakings much easier to perform. If something feels like it takes less effort to accomplish it then people are more likely to try to accomplish it. My guess is that youthfulness will increase accomplishment by making work seem more effortless. My further guess is that this feeling of effortlessness will outweigh the effect that will come as the prospect of a long life removes the sense of urgency for the need to ccomplish things before getting too old. So the possibility exists that external measures of ambition will rise even as internal feelings of ambition decline. People might actually end up feeling less ambitious even as they accomplish more due to the ease with which they will be able to exert themselves.

Whether future eternally youthful people will become less ambitious also depends on the answer to the same question I raised about eternal youthfulness and risk aversion: What kinds of personalities will people choose to give themselves once they are able to make enduring changes to their personalities? People could choose to give themselves hard driving highly motivated and goai-oriented personalities. In that case, people might use multi-thousand year lifespans to carry out plans that take hundreds or thousands of years to execute. Or they might just keep going around and finding new goals to achieve that take less time to accomplish.

The bigger question I have about personality engineering is this: Are there personality types which people are less likely to change away from and therefore will people who periodically change their personalities eventually end up at one of the personality types that people tend to not want to switch away from? One might imagine each personality as having something akin to an energy state. The lower the energy state the less the likelihood that a person, once in that state, would ever decide to leave it. Perhaps once it becomes very easy to change personality types the human race will gradually distribute out into the "low energy state" personality types. There may be radically different personality types which each cause the people who think as those types to totally lack the desire to become another type. So humanity might end up dividing up into those types, whatever those types might be.

By Randall Parker    2004 January 16 12:49 AM   Entry Permalink | Comments (13)
2003 September 16 Tuesday
Will Longer Lives Make People More Risk Averse?

University of Colorado aging researcher Tom Johnson takes exception with U Cambridge biogerontologist Aubrey de Grey's argument that life extension will make people more risk averse.

"Look at who dies in accidents now," he said. "It's people in their twenties, who already have the most to lose."

That's because people don't become cautious until they feel the first tinges of mortality in their joints, he reasons.

"And if you feel fairly youthful at the age of 100, you're more likely to go bungee jumping and sky-diving," he said.

But is this simply because those twenty somethings feel young? Or are they lacking in the experience and wisdom that comes with age that teaches people not to act so crazy?

Aubrey takes his prediction of risk aversion to the point of predicting the end of high speed ground travel.

back in 1999 I predicted that, once we cure aging, driving (even on the ground!) will be outlawed as too dangerous for others. Remember also that when we have so many more years ahead of us, we won't need to be in such a hurry all the time, so flying cars would only be for recreation anyway.

My own guess is that Aubrey is atypical in the intensity of his desire to avoid death. If he wasn't then there'd be a lot more advocates of a massive effort to reverse aging than there currently are and more people would make it the chief goal of their life. Though perhaps many would rethink their views if they knew they could entirely avoid aging and achieve engineered negligible senescence.

So will people choose to live less risky lives once we can stop and reverse aging? That depends on human nature. Some people are thought to have an innate urge for sensation-seeking and to be risk-takers by nature. One possible explanation involves differences in cortisol levels. Another proposed explanation is that genetic variations on dopamine receptor genes DRD2 and DRD4 as a cause of dangerous thrill-seeking behavior. However, that report has been contradicted by later studies that have failed to find confirmation for a link.

We are still in the early days for discovering the genetic factors that affect behavior. But it seems likely that there are underlying genetic causes of differences in the desire to engage in highly risky and thrilling behaviors. Once those causes are discovered it is almost a certainty that drugs and other therapies will be devised for modifying human personalities to make a person have a greater or lesser desire to engage in dangerous activities. So this brings us back to the question of what people will do once they have youthful life expectancies that are, for all intents and purposes, of an indefinitely long duration. Whether those who currently are risk-averse will become even more risk-averse and whether the risk-takers will become risk averse depends heavily on this basic question: What kinds of personalities will people choose to give themselves once they are able to make enduring changes to their personalities?

Your guess is as good as mine. What do you think? Will people choose to become risk averse and give up driving and flying? Or will the timid chartered accountants of the world decide to fulfill their dreams to become lion-tamers by having their personalities altered so that they can be fearless in the face of a dozen lions propped up on circus stands in the big top?

By Randall Parker    2003 September 16 03:08 PM   Entry Permalink | Comments (3)
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