Woman laughing while talking on the phone

Photo: Portra/Getty Images

4 of 8
Get on the Phone

Friends keep you young, no joke. "If someone asked me, 'Should I eat salad or have a cup of coffee with a friend?' I'd say, 'Meet the friend,'" says Carr. This is one of the most surprising factors in longevity and feeling younger. "In many ways, we see social relationships as more powerful than traditional health behaviors like diet and exercise," she says. Loneliness is a key predictor of aging. Nurture your meaningful friendships as you age.