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Unformatted text preview: really was nasty, brutish and short. source: “older Age Becomes common l Ate in humAn evolution,”
By rAchel cAspAri And sAng-hee lee, in PNAS, vol. 101, no. 30; july 27, 2004 Growing Older Illustration by Portia Sloan Rollings, Graphic by Jen Christiansen sad0811Casp3p.indd 47 August 2011, ScientificAmerican.com 47 6/21/11 5:43 PM adults survived to the age at which one could first become a
grandparent. Our objective was to evaluate changes over evolutionary time in the ratio of older to younger adults—the socalled OY ratio. Among primates, including humans up until
very recently, the third molar erupts at about the same time that
an individual becomes an adult and reaches reproductive age.
Based on data from Neandertals and contemporary huntergatherer populations, we inferred that fossil humans got their
third molars and had their first child at around age 15. And we
considered double that age to mark the beginning of grandparenthood—just as some women today can potentially give birth
at age 15 and those women can become grandmothers when
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This note was uploaded on 02/20/2013 for the course ANTH 101 taught by Professor Roseman during the Spring '12 term at University of Illinois, Urbana Champaign.
- Spring '12