Clock Ticks for Male Fertility Too

When couples have trouble conceiving a child, the problem lies with the man as often as with the woman, according to some fertility experts.

Dr. Marc Goldstein of New York Presbyterian Hospital, told MSNBC that men also become less fertile with age; it's just a more gradual process for them.

Dr. Narendra Singh of the University of Washington says that sperm cells in older men are more likely to have damaged DNA. "We found that there is a sudden change around 35 years of age," Singh told MSNBC. Experts like Singh say men should be aware that their biological clock can also run out of time.

According to a Dec. 20 report on fertility treatments, issued by the U.S. Centers for Disease Control and Prevention, about 2.1 million Americans have fertility problems.

-- Felicity Stone

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