Women these days live far, far longer than evolution intended. Get
used to it. It aint pretty. But then old men aren't much either.
Read Jared Diamond "Why is Sex Fun?" In that book he postulates that
Menopause is necessary for our survival. Because of our big head child
birth is dihibiliting and can lead to death. Having a grandmother around
who can help care for the mother and child increases the chances of survival
of both. Menopause saves the older woman from the rigors and real danger of
childbirth.