Here’s some good news for women who have had babies after the age of 33: odds are they’ll live longer than women whose last child was born before they reached 30. The age at last childbirth can indicate the rate of biological aging, according to a study of families with members who lived exceptionally long lives. “The natural ability to have a child at an older age likely indicates that a woman’s reproductive system is aging slowly, and therefore so is the rest of her body,” researcher Thomas Perls, M.D., M.P.H. explained in a press release. The genetic variants that allow women to have babies naturally after age 33 might also be responsible for exceptionally long life spans, the study suggested. The findings came from an analysis of data from the Long Life Family Study (LLFS)—a biopsychosocial and genetic study of 551 families with multiple members who attained exceptionally old ages. The researchers determined the ages at which 462 women had their last child, and correlated that age with their longevity. They found that women who had their last child after the age of 33 years had twice the odds of living to 95 years or older compared with women who had their last child by age 29. Earlier data from this study showed that women who gave birth naturally after age 40 were four times more likely to live to 100 than women who had their last child earlier in life.
Thomas T. Perls et al, “Extended maternal age at birth of last child and women's longevity in the Long Life Family Study.” Menopause, The Journal of the North American Menopause Society, June 23, 2014