There is the curious case of human menopause and grandmothers.  Most species procreate young until death.  But humans specifically have woman productively live raising grandchildren 10-20 years after losing fertility.  Not quite sure when this evolved, but over a hundred thousand years ago.<p>I think one of Goodall&#x27;s original female chimps is still popping them out every 3-4 years at age 50, if I am not wrong.