Relationships · The biggest single predictor of how long, and how happily, you will live.

The longest study of human happiness ever conducted, the Harvard Adult Development Study, started in 1938 and still running, has one finding so clear it is almost embarrassing: the people who are happiest, healthiest, and live longest are the ones with warm relationships. Bigger than wealth. Bigger than fame. Bigger than cholesterol. This page renders eight decades of relationship science into mod