A two-sex PDE model finds two stable equilibria (great-ape and hunter-gatherer longevities) with grandmothering enabling the transition without changing fertility end, while male mating skew strongly affects lifespan equilibrium.
C., Altmann, J., Brockman, D
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Evolution of longevity, age at last birth and sexual conflict with grandmothering
A two-sex PDE model finds two stable equilibria (great-ape and hunter-gatherer longevities) with grandmothering enabling the transition without changing fertility end, while male mating skew strongly affects lifespan equilibrium.