It is observed women lives longer than men?
as a general rule
1Why Women Live Longer than Men
By William J. Cromie
Studying people who live 100 years and more leads Harvard researchers to conclude that menopause is a major determinant of the life spans of both women and men.
Women's life span depends on the balance of two forces, according to Thomas Perls, a geriatrician at Harvard Medical School. One is the evolutionary drive to pass on her genes, the other is the need to stay healthy enough to rear as many children as possible. "Menopause draws the line between the two," Perls says. It protects older women from the risks of bearing children late in life, and lets them live long enough to take care of their children and grandchildren. ...more