by TWilliam » Sun 29 Nov 2009, 16:03:03
$this->bbcode_second_pass_quote('Ludi', '&')quot;Post-reproductive longevity is a robust feature of human life and not only a recent phenomenon caused by improvements in sanitation, public health, and medical advances. We argue for an adaptive life span of 68-78 years for modern Homo sapiens based on our analysis of mortality profiles obtained from small-scale hunter-gatherer and horticultural populations from around the world. We compare patterns of survivorship across the life span, rates of senescence, modal ages at adult death, and causes of death. We attempt to reconcile our results with those derived from paleodemographic studies that characterize prehistoric human lives as "nasty, brutish, and short," and with observations of recent acculturation among contemporary subsistence populations. We integrate information on age-specific dependency and resource production to help explain the adaptive utility of longevity in humans from an evolutionary perspective."
The fact that someone
argues for a particular idea doesn't necessarily make it so. I note that they base their conclusions primarily on studies of
modern HG/Horticultural societies, and as they then note they attempt to reconcile this data with the contradictory paleodemographic data about ancient HGs. IMO the reconciliation lies in the fact that
modern HGs are not
entirely identical in functioning to those earlier HGs; they too have evolved, so the fact that
they experience greater longevity does not necessarily indicate that their ancient forebears did.
Personally I suspect that increasing longevity in the human species was at least as much a function of expanding linguistic and communication ability as of genetics. In other words, as our
wisdom about the world grew and as we became better able to
pass that wisdom down to our descendants, we became increasingly adept at surviving the vicissitudes of life, leading to greater longevity. An ability to learn not only from one's own mistakes, but from the mistakes of one's predecessors as well, increases one's overall odds of survival.
"It means buckle your seatbelt, Dorothy, because Kansas? Is goin' bye-bye... "