Living Forever is Hard, part 2: Adult Longevity
Previous: “Living Forever is Hard, or, The Gompertz Curve”
Following Fight Aging’s “A Primer on Compression of Morbidity” today to Fries’s 2011 review article “Compression of Morbidity 1980–2011: A Focused Review of Paradigms and Progress” (Fries, incidentally, introduced the concept of “compression of morbidity” in 1980), I found some interesting details in it.
From section 3:
Mortality changes can be tracked with acceptable accuracy using the Vital Statistics of the United States or other sources [16]. Figure 2 summarizes the US data since 1900, which is generally similar to that of other developed nations. All measures of longevity increase monotonically for almost all years, providing periodic headlines and prophecies of impending crises. The real message, however, is that longevity gains from age 65 and above are quite slow and probably getting slower.
...Table 1 shows the average number of years of life remaining from 1900 to 2007 from various ages, combining both sexes and ethnic groups. From birth, life expectancy increased from 49.2 years (previously estimated at 47.3 years in these same sources) in 1900 to 77.9 in 2007, a gain of life expectancy of nearly 29 years and a prodigious accomplishment. The increase was largely due to declines in perinatal mortality and reduction in infectious diseases which affected mainly younger persons. Over this period, developed nations moved from an era of acute infectious disease to one dominated by chronic illness. As a result, life extension from age 65 was increased only 6 years over the entire 20th century; from age 75 gains were only 4.2 years, from age 85 only 2.3 years and from age 100 a single year. From age 65 over the most recent 20 years, the gain has been about a year [16].
Much confusion in longevity predictions comes from using projections of life expectancy at birth to estimate future population longevity [18]. For example, “If the pace of increase in life expectancy (from birth) for developed countries over the past two centuries continues through the 21st century, most babies born since 2000 will celebrate their 100th birthdays” [29]. Note from the 100-year line of Table 1 that life expectancies for centenarians would be projected to rise only one year in the 21st century, as in the 20th. Such attention-grabbing statements follow from projecting from birth rather than age 65, thus including infant and early life events to project “senior” aging, using data from women rather than both genders combined, cherry-picking the best data for each year, neglecting to compute effects of in-migration and out-migration, and others....Over the 107-year base period, the increase in life expectancy from birth over that from age 65 is approximately fourfold; over the 27-year base, it is less than twofold, documenting a flattening of the rate of increase in more recent periods (in the US). The “Point of Paradox” is the point at which the converging lines would cross. With the 107-year base, the Point of Paradox occurs in 2035 at an average age of 85.4....Since 1980 [1], we have performed similar calculations using data from many nations and many baseline periods and from different ages, with congruent results. The maximal average age ranges from 85 to about 93 years, with later base periods tending to be higher, and Japan and several other countries higher than the US We estimated the US maximum average life expectancy at 85 years in 1980, and now at 90 years. US White females currently project to 90.1 years. Thus, given generally stable trends, the maximal attainable mean life expectancy appears to be greater than 90 years and is almost certainly less than 100, far less than the 150 to 200 years still projected by some enthusiasts [29]
Related material is in Mike Darwin’s ongoing series, “Interventive Gerontology”:
- Living Forever is Hard, part 3: the state of life extension research by 23 Apr 2012 18:17 UTC; 16 points) (
- 3 Oct 2012 22:39 UTC; 15 points) 's comment on [Link] The real end of science by (
- 5 Dec 2011 16:51 UTC; 9 points) 's comment on 2011 Survey Results by (
- 15 Jul 2012 19:43 UTC; 5 points) 's comment on What Longevity Research Most Excites You? by (
Two main criticisms (of the data/arguments provided in the linked Mike Darwin pages):
Promotion of / dependence on Ancel Keys’ Seven Countries study, when it is less than worthless (i.e., actively harmful). See, for example: “In his review Keys presented a perfect curvilinear correlation between the mortality from coronary heart disease and the consumption of fat in six countries, but his curve was based on a selection of countries that fit his hypothesis and it has not been confirmed in studies including many more countries (50).” “The seven countries were admittedly selected by Keys. Such selection may be helpful to illustrate an idea at a preliminary stage, but a proof of causality demands random data. In more recent studies, including many more countries, the association was weak, absent, or inverse (52).” (quotes and footnotes available at http://www.ravnskov.nu/myth4.htm)
Darwin demonstrated a stark lack of understanding of the “traditional foods” movement (of which Cordain-leaning Paleo is just one variant, and of which I personally am not a fan). Much of what he said is outright false, inaccurate, or incomplete in ways that are important to pulling about the muddle of misinformation about nutrition. He should have just left his “Paleo” commentary out, since he clearly hasn’t done the research to understand the claims.
The curious could look at Whole Health Source (http://wholehealthsource.blogspot.com/) especially with respect to the Kitavans, Masai, Tokelau, Inuit, and other traditional cultures with a wide spectrum of healthful diets, but all of it is good, The Perfect Health Diet (http://perfecthealthdiet.com/), and Archevore (http://www.archevore.com/get-started/) as starting points. There is a lot to read.
Or go the Quantified Self n=1 route: pick one of the three sites above, follow the advice for a month or three, and see how you feel, tracking as much as you can (mood/well-being, weight, sleep patterns, etc.) Like Max More, I am measurably improved on every health marker, as are a number of my friends and acquaintances.
Up-voted for the great links at the end about diet and nutrition as related to longevity. I’ve been looking for something exactly like that (a relatively scientific overview of nutrition as related to living as long as possible) for a long time.
Thanks!
Edward Marks, “Life Expectancy” Doesn’t Measure How Long You’re Expected to Live
Before: I Don’t See Any Evidence That We’ll Live Hundreds of Years
--”Gut Infections Are Growing More Lethal”, NYT
The ChronoPause links appear to be broken and/or the site is down. Is there any place to see cached versions of them, or have they been posted elsewhere? Perhaps re-posting them (if permission is given) to a LessWrong wiki area would be a good idea?
I have copies, of course, but I think it’s a bit premature to start posting them—few sites have 99.999% uptime.
It’s been down for quite a while now though. And it’s not just me. I agree that waiting is a good idea. But it’s been at least 7 hours for me. Sites don’t often experience 7 hours of downtime either. It was certainly worth asking if handy other copies existed and were easy to get to.
Your link says that the site is up, and indeed, it works for me.
(I hope this incident has been educational.)
It has confirmed that asking for additional links was the right thing to do. It cost me nearly nothing to ask but would have allowed me to read the papers beginning a full day sooner had there been an existing alternate web archive of them. For such low cost (asking in a comment), the potential gain (getting to read the papers sooner rather than waiting almost a full day for the site to come back up) was certainly worth the ~3 seconds it took to ask the question.
And in the mean time wasted more than 3 seconds of my time and the time of all future readers who don’t care about a day-long or less outage back in early 2012.
Thanks.
This effect is too small to care about. When I come across such comments in other threads, I am able to quickly bypass them and the net effect is surely less than round off error from all other noisy inefficiencies. I’d say that by harping on my low threshold for asking, you’ve wasted more time (including your own) than just ignoring me in the first place.