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> As for natural selection of long-living adults, there is a nice contradiction in that although you are likely to live longer in a society that looks after your health and social needs, you are less likely to be needed to share the burden of caring for grandchildren in such a society, and there is, therefore, less scope for natural selection to play its part. -- Well, from the perspective of natural selection, the only criteria for long life as evolutionary trait would seem to have your own children late in the life. I mean -- if you only get children when young, then you pass your genes anyway, even if you have some genetic screwup that kicks in at, let's say around 30. If you also have children when older, then you have qualified as somebody who can give genes that have better chance to live for longer (since you did).
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