Men's biological clocks are ticking, too

Evidence is piling up that men, or at least our reproductive parts, have a "best before" date. Not only is it harder to create a pregnancy after the age of 35 or 40, researchers are finding that our sperm quality decreases with age. This can result in a higher-than-normal incidence of offspring with schizophrenia, autism and low IQ, as well as an increased chance of miscarriage.