Your grandma may be old. That doesn't mean you will be

Think you'll be around for a long time because Grandma lived to a ripe old age? Not so fast: Genetics has only a small impact on longevity, a new study involving more than 400 million people suggests. Longevity is mostly decided by lifestyle, with less than 10% down to DNA, according to the study, published Tuesday in the journal Genetics.

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