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MONDAY, April 17 (HealthDay News) -- Society's oldest members are most likely to be born to its youngest mothers, new research suggests.
The odds of living to 100 and beyond double when a person is born to a woman under 25 years of age, compared to those people born to older mothers, according to one of the most rigorous studies on the subject yet conducted.
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The finding may also help clear up a statistical mystery -- three years ago, the same husband-and-wife team of researchers found that being the first-born child in a family also boosted longevity, although no one knew why.
"It turns out that the whole phenomenon of first-born order and longevity is driven by young maternal age," said study co-author Leonid Gavrilov, a research associate at the Center on Aging at the University of Chicago.
In other words, he said, first-born children are simply more likely than their siblings to have been born when mom was in her teens or early 20s.
The study, which was funded by the U.S. National Institute on Aging (NIA) and the Society of Actuaries, was presented recently at the Population Association of America annual meeting, in Los Angeles.
As nutrition and health care continue to improve, so too does the number of Americans whose years extend into the triple-digits.
"Certainly there were more [centenarians] in the 2000 census than there were in 1990, and most people think this population will grow," said Georgeanne Patmios, acting chief of the Population and Social Processes Branch of the NIA's Behavioral and Social Research Program.
According to the Census Bureau, there were 37,000 Americans aged 100 years or older in 1990, and by 2000 that population had risen to 55,000. According to experts, women are three to five times more likely to live beyond 100 than men.
But what other factors encourage "extreme" old age? Previous research by Gavrilov and his wife/co-researcher, Natalia Gavrilova, has uncovered some clues. For example, in research published over the past few years, they found that U.S. centenarians were more likely to come from farming families in the Midwest than from any other demographic.
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