The Cougar Phenomenon: Why Older Women Should Choose Young Lovers
Women in their 40s should look for younger partners to boost their chances of becoming pregnant, new research suggests.
...in younger women the egg can correct any defects in the sperm. The sperm is mainly a delivery device for genetic material but the egg is more complex. (So) in younger women the eggs are such that they can fix any defects …. but once a women hits 40 that is no longer true”.