Live till you're 100

Surprising Signs You'll Live to 100

You're the life of the party

Outgoing people are 50 percent less likely to develop dementia, according to a recent study of more than 500 men and women age 78 and older from the Karolinska Institutet in Sweden. Participants also described themselves as not easily stressed.

Researchers speculate that their more resilient brains may be due to lower levels of cortisol -- studies show that oversecretion of this "stress hormone" can inhibit brain cells' communication. Science-backed ways to cut cortisol levels: Meditate, sip black tea, or take a nap.

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