The Harvard Study of Adult Development has been running for 81 years. It
started out in 1938 by following 724 men from two groups of men whose
social backgrounds could not have been more different: Priviledged Harvard
Sophomores and young men from an underpriviledged neighbourhood. Today, it
includes the children of the initial study participants.

Here’s what’s striking: The researchers have found that happiness and
health in late life depend less on genes, wealth or education than on…