I'd be interested in how they established an average age of 18 for female first reproduction.
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This is what we see in modern foraging populations. There's some variation. In the Pume it's 15, in the Hadza it's 19. So about 18 is a good estimate.
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Has also other consequences: With mortality of 40% to 50% until age 30, replacement fertility is in a range from 3.3 to 4, way below potential of perhaps 8. Populations had to stabilize at some point, but it must have been via fertility, not mortality. Shreds Malthusianism.
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If human populations can and do stabilize via fertility, there is no oversupply of people as Darwin assumes (taking Malthus for granted). Limits the role of natural selection dramatically, mostly only for features that lead to a massive increase in mortality. for others unclear.
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Redefining Knowledge of Elderly People Throughout History Redefining what we know about elderly people in cultures throughout history, & dispelling the myth that most people didn't live much past 40 prior to modern medicine. http://www.sciencedirect.com/science/article/pii/S0278416517300648 …pic.twitter.com/gFJi5fDs9j
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Interesting, Never could understand menopause because there didn't seem to be any reproductive value to all that hormonal shifting, but if the wisdom of older women improves a community's survival, I can see some evolutionary sense in longevity.
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Three score and ten.
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In my class at school, most of the girls not going on to higher education had produced a baby by 17, several, illegally at 16. 18 seems rather old?
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