The Italian island of Sardinia has more than six times as many centenarians as the mainland and ten times as many as North America. Why? According to psychologist Susan Pinker, it's not a sunny disposition or a low-fat, gluten-free diet that keeps the islanders healthy -- it's their emphasis on close personal relationships and face-to-face interactions. Learn more about super longevity as Pinker explains what it takes to live to 100 and beyond.

The secret to living longer may be your social life

A remote Sardinian village boasts six times as many centenarians as the Italian mainland, defying global trends where women far outlive men. The secret is not genetics, optimism, or diet, but a culture built around dense, daily, in-person social ties. Research shows that social integration and close relationships predict lifespan more powerfully than exercise or healthy eating. Real human contact unleashes biological benefits that shield people from disease and decline.