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entirelyuseless comments on A Map of Currently Available Life Extension Methods - Less Wrong Discussion
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That data must be flawed. Only by 1980 did life expectancy pass 52 years at at the age of 20. That paper suggests that hunter-gatherers were healthier than people in 1980's which cannot be true. (http://www.infoplease.com/ipa/A0005140.html)
I don't think we have any good data on life expectancy among hunter-gatherers. Many people argue that life expectancy went down significantly with the transition from hunter-gatherer societies to agricultural societies. That may or may not be true but the statistics you link are not relevant to the claim. Just because life expectancy has been going up for the last few hundred years does not prove that it was even lower some thousands of years ago.