Why Women Live Longer than Men
In all developed countries and most undeveloped ones, women outlive men, sometimes by a margin of 10 years. In the U.S., average life expectancy at birth is about 79 years for women and about 72 years for men. Harvard researchers studied people who live 100 years and more to conclude that menopause is a major determinant of the life spans of both women and men. A women's life span depends on the balance of two forces. One is the evolutionary drive to pass on her genes; the other is the need to stay healthy enough to rear as many children
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