Autumn Birthday Ups Odds of Living to 100: Study

THURSDAY, July 19 (HealthDay News) — You may think of your
birthday as only being important to your age and the possible presence of
candles, cards and cake, but a new study suggests a link between your
month of birth and longevity.

Researchers found that those who were born between September and
November from the years 1880 to 1895 were more likely to reach the
100-year mark than their siblings who were born in March. The study does
not prove a cause-and-effect link, just an association.

The meaning of the findings is unclear, and a researcher who studies
lifespan called them mostly irrelevant to modern times.

But, Leonid Gavrilov, from the Center on Aging at the University of
Chicago, who wrote the study with his wife, Natalia Gavrilova, said the
findings point to the importance of the environment in which a child is
conceived and later grows.

“We believe that avoiding any potential sources of damage to developing
fetus and child may have significant effects on health in later life and
longevity,” Gavrilov said. “Childhood living conditions may have
long-lasting consequences for health in later life and longevity.”

The researchers looked at 1,574 centenarians — people who reached the
age of 100 — in the United States. They found that those people born
between September and November had about a 40 percent higher chance of
living to 100 than those born in March.

Of course, the chances that people born in 1889-1895 would even reach
the century mark was very low to begin with. Of those born in 1900 who
were still alive at 50, just a third of 1 percent of men made it to 100,
and just shy of 2 percent of women accomplished the feat, Gavrilov
said.

Why might month of birth — or month of conception — affect how long
someone lives? One possibility is that seasonal diseases played a role,
Gavrilov said.

S. Jay Olshansky, a professor of public health at the University of
Illinois at Chicago who’s familiar with the findings, said the study is
not newsworthy. “The results are probably valid, but largely irrelevant in
our modern world since they apply to birth months from more than a century
ago.”

Regardless of the month someone was born or conceived, the odds are
slim that you’ll live to be 100. “This prospect has been rising through
the 20th century, but not dramatically,” Olshansky said.

At best, he said, “this research might offer a partial and extremely
small explanation for a small fraction of why some people conceived and
born more than a century ago lived for 100 years.”

What does all this mean for your chances of living to 100 if you were
born around the fall or — perhaps less luckily — in March? Good
question — and one that won’t be answered until people around your age
start hitting the century mark.

The study appeared in the Journal of Aging Research.

More information

For more about healthy aging, try the U.S. National Library of
Medicine.

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