For Most Centenarians, Longevity Is Written in the DNA

Study reveals many genetic paths to 100.

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Sebastiani says, “One can conjecture that genetically we’re built to live longer,” and longer life expectancies associated with improved public health measures seem to bear that out.

Other studies have shown that genetics account for only 20 percent to 30 percent of a person’s chances of living beyond age 85. Environmental factors, including lifestyle choices such as diet, smoking and exercise habits, are still the most important determinants of longevity.

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