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tim comments on Why people want to die - Less Wrong Discussion
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Life expectancy (at age 0) has increased mainly because infant mortality and child mortality has decreased dramatically, not because people used to collectively live to 30's and now live to 70's. Most adults in our ancestral past lived to be about as old as people do in western industrialized nations today.
Huh, I have harbored that misconception for a really long time. Pretty annoyed that I never thought to examine that statistic further (it just sounds so right!). Thank you.
e: regardless of the fact that there is a decade or so of actual increased lifespan between the two periods, this still solidly harpoons my analogy.