Is There a Gene For Long Life?

Centenarians tend to be smiley, happy people.

The foundation of youth may be in your DNA! A new study of centenarians (people who reach age 100+) found that certain genetic personality traits (such as being optimistic and loving laughter) are especially common in old age. Don't underestimate the power of a good belly laugh. It might just mean you're on your way to your longest, most beautiful life!

MORE: Does Thinking Well of Others Enhance Pleasure?

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