Body type was useless as a predictor of how the men would fare in life. So was birth order or political affiliation. Even social class had a limited effect. But having a warm childhood was powerful. As George Vaillant, the study director, sums it up in “Triumphs of Experience,” his most recent summary of the research, “It was the capacity for intimate relationships that predicted flourishing in all aspects of these men’s lives.”
Of the 31 men in the study incapable of establishing intimate bonds, only four are still alive. Of those who were better at forming relationships, more than a third are living.