Compared to our parents' generation, men and women nowadays are getting married and having kids at a later age. But are there consequences to having a child later in life?

Only if you're a dude, according to a new study, which reports that infants and young children of older fathers don't perform as well on a range of cognitive tests measuring the ability to think and reason. Children of older mothers, however, gain higher scores in the same tests. In addition, the study found a link between older fathers and birth deformities, cancer and certain neuropsychiatric conditions in their children.

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May-December Romances

    Woody Allen and Soon Yi Previn
    By far the creepiest May-December romance, Allen and Soon-Yi met when she was his adopted daughter. Barf. Allen is 35 years older than his bride.

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    Harrison Ford and Calista Flockhart
    Ford is 22 years older than his fiance -- and has a much higher body-mass index.

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    Ashton Kutcher and Demi Moore
    Demi totally punk'd us all when she snagged adora-boy Ashton, who is 15 years her junior.

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    Tim Robbins and Susan Sarandon
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    Jerry Seinfeld and Jessica Sklar
    Jerry is 17 years older than his wife Jessica, but that's nothing compared to the age difference between him and previous girlfriend Shoshanna Lonstein. Seinfeld met Lonstein when he was 39 and she was a 17-year-old high school senior.

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    Charlie Sheen and Brooke Mueller
    Bad boy Charlie Sheen never fails to trick a young beautiful woman into bed. His current love, Brooke Mueller, is 12 years his junior.

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    Larry Fortensky and Elizabeth Taylor
    Elizabeth's eighth marriage (but seventh husband), Larry Fortensky was 20 years her junior. The pair, who met in rehab, were together for five years before splitting in 1996.

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    Justin Timberlake and Cameron Diaz
    Cameron was nine years older than her *NSync beau -- but just as hot.

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    Donald Trump and Melania Knauss
    The Donald is 28 years older than his squinty, model-sexy wife.

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    Michael Douglas and Catherine Zeta-Jones
    Hollywood dinosaur Douglas snagged the much-younger Zeta-Jones with the classic line, "I want to father your children." It apparently worked on Zeta-Jones, who is 25 years younger than Douglas: The couple has two children.

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Researchers believe it's a combination of social factors and genetics that affect a child's cognitive ability. While women are born with all of their eggs, men accumulate sperm over their lifetime. The older a man gets, the more likely the incidence of mutations in his sperm, which can affect the health and cognitive development of his children.

So despite all the scary talk about women's aging eggs, there's a just-as-pressing expiration date on sperm as well. (Not to mention the always-pressing concern of breaking a hip in a playground-related incident.)


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