[philwelch]

When the life expectancy was 35, nobody was dying of old age at 35. There were still septuagenarians. To provide an intentionally simplified example, a population where half of the people die of old age at 70 and the other half die in childbirth at age 0 has a life expectancy of 35. Even adding ten years to the life of every adult in that population only improves life expectancy by five years. Reducing infant mortality was a much better investment, though (fortunately!) we’ve been so successful at it that we may be at a point of diminishing returns.

[jaybrendansmith]

All correct points that do not impact the core of the argument. It is all of it, in aggregate, that improves life expectancy. If you read literature, people who were older than 40 or 50 were 'wise old men', and 80 was a rare Methuselah, who was described as 100s of years old. Thanks to statins, and various cancer treatments, and stints, and blood thinners, and many other remedies, living to 80 is not rare, and most people who live beyond it can best be described as people who listen to their doctor and take their meds on time.

[philwelch]

Even in today’s tech industry, people who are older than 40 or 50 are considered wise old men when they can get hired at all. But yes, we have extended adult lifespans, just not by 40 years which is the naive assumption many people make from the observation that life expectancy used to be 35. Also, I would expect that most of the extension in adult lifespan has less to do with old people having better medication than with broad declines in smoking and alcohol consumption. How long into your eighties and beyond you will live is largely determined by lifestyle decisions made in your teens, twenties, and thirties (though it is never too late to quit smoking!)