Age at Last Birth
When grandmothering improves daughters' fertility, selection can maintain average last-birth age near 45 to 50 years. The model represents female fertility ending through an evolvable trait that allows last-birth ages from 20 to 75 years.…
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When grandmothering improves daughters' fertility, selection can maintain average last-birth age near 45 to 50 years. The model represents female fertility ending through an evolvable trait that allows last-birth ages from 20 to 75 years. During the grandmothering transition, age at last birth initially declined and later rose after adult lifespan crossed a threshold. The study tests whether age at last birth can evolve while grandmothering still produces human-like life history.