The Good Life: Lessons from the Harvard Study

What 80+ years of longitudinal data suggest about relationships and wellbeing

What did the Harvard Study find about a good life?

The Harvard Study of Adult Development is a longitudinal study of adult life begun in 1938, later directed by George Vaillant and today by Robert Waldinger. It follows two original cohorts: the Grant Study of Harvard undergraduates and the Glueck Study of boys from inner-city Boston, with the participants' descendants added in later decades. Its headline finding is that the quality of a person's close relationships is a better predictor of health and happiness in later life than wealth, fame, social class, or cholesterol at 50. That finding rests on genuinely rare data — decades of repeated measurement on the same people — but three limits should travel with it. The study is observational, so it establishes that relationship quality and wellbeing move together over time, not that one causes the other; people who are healthier may simply find relationships easier to sustain. The original cohorts were entirely male, almost entirely white, and drawn from a narrow slice of mid-century Boston, so how far the findings generalise to women, to other ethnic groups, or to other societies is genuinely open. And because participants were recruited nearly a century ago, some of what the study tracks is a portrait of one cohort in one era as much as a fact about adult life in general.

Since 1938 the Harvard Study of Adult Development has followed hundreds of people across their entire adult lives, tracking health, work, and relationships through repeated interviews, medical records, and questionnaires. It began as two separate projects — the Grant Study, following Harvard sophomores, and the Glueck Study, following boys from disadvantaged Boston neighbourhoods — which were later merged. George Vaillant directed it for decades; Robert Waldinger directs it now and, with Marc Schulz, wrote the popular account, The Good Life. Its headline finding is durable and humbling: warm relationships, more than money or status, track with who stays healthy and happy into old age. Two things are worth holding alongside that. It is observational research, so it shows relationships and wellbeing moving together rather than proving that one produces the other. And its original participants were all men, overwhelmingly white, and drawn from a narrow band of mid-century American life, so the finding is best read as a strong signal from a particular population rather than a universal law. The practices below are honest applications of a correlation worth taking seriously — not guarantees.