The Harvard Study of Adult Development, which began in 1938, is the longest in-depth study of adult wellbeing ever conducted.
Originally involving 268 Harvard students and 456 Boston men, the study now includes over 1,300 descendants.
Research Director Robert Waldinger states the core finding: the quality of a person's close relationships correlates more strongly with happiness and health in old age than income, fame, social class, or IQ.
The Harvard T.H. Chan School of Public Health reports that individuals with strong social bonds show lower rates of heart disease, diabetes, and arthritis. Data also indicates married participants lived longer-by 5-12 years for women and 7-17 years for men.
The protective factor is relational depth, not breadth. A few trusted connections outweigh a large network of acquaintances. Conversely, chronic loneliness carries a significant physical health cost.
The study suggests that investing time in nurturing close relationships may be the most critical investment for long-term wellbeing.
