As the Harvard Gazette summarized in 2017: Close relationships, more than money or fame, are what keep people happy throughout their lives.... Those ties protect people from lifes discontents, help to delay mental and physical decline, and are better predictors of long and happy lives than social class, IQ, or even genes. That finding proved true across the board among both the Harvard men and the inner-city participants.[7] Men whod had warm childhood relationships with their parents earned more as adults than men whose parent-child bonds were more strained. They were also happier and less likely to suffer dementia in old age. People with strong marriages suffered less physical pain and emotional distress over the course of their lives. Individuals close friendships were more accurate predictors of healthy aging than their cholesterol levels. Social support and connections to a community helped insulate people against disease and depression. Meanwhile, loneliness and disconnection, in some cases, were fatal.

The Power of Regret by Daniel H. Pink