Uncovering the keys to a contented life can span an entire lifetime. For 88 years, the longest-running study on happiness has persisted.
In 1938, Harvard University researchers initiated a study to examine the lives of two groups of young White men: one group comprised privileged Harvard students, including John F. Kennedy before his presidency, and the other consisted of disadvantaged teenagers from one of Boston’s poorest neighborhoods during the Great Depression.
Over the years, the Harvard Study of Adult Development has expanded to include hundreds more participants, encompassing women and children, and the research continues today.
The study is now considered the longest of its kind, requiring several generations of researchers and four directors to maintain its progress. It boasts a remarkably low dropout rate, a rarity for a study of this duration.
frameborder=”0″ allow=”accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share” referrerpolicy=”strict-origin-when-cross-origin” allowfullscreen>After eight decades, the team has published hundreds of peer-reviewed papers and conducted numerous surveys, medical examinations, and interviews with participants. This research has yielded significant insights into what best predicts health and well-being in later life.
Contrary to assumptions, wealth, fame, hard work, intelligence, or even genetics were not the primary indicators of a happy and meaningful life.
About 30 years ago, the research team discovered an unexpected link between the quality of close relationships and the perceived quality of life.
While the study cannot conclusively prove that relationships cause happiness or good health, the observed patterns are suggestive.
When researchers assessed data from participants at age 50, they found that relationship satisfaction, rather than physical health markers like cholesterol levels, was the strongest predictor of longevity. Individuals most content with their social connections in middle age were healthier at 80, less prone to illness, and more resilient to disease.
“We didn’t believe the data at first,” psychiatrist Robert Waldinger, the current study director, remarked in a 2023 TED Talks video with over 1 million views.
“How could this be that relationships actually get into our bodies and shape our health?”
The study repeatedly shows that connections to family, friends, and community are linked to longer, happier, and healthier lives. Other research supports the notion that relationships can maintain physical strength and cognitive clarity with age.
Conversely, loneliness has been identified as a significant risk factor for poor well-being. Some studies suggest that social isolation can increase the risk of early death by over 25 percent, and may even alter brain function and structure.
However, simply being constantly surrounded by people isn’t the solution. The focus should be on nurturing quality relationships, as Waldinger explains.
In a 2010 peer-reviewed study, Waldinger and clinical psychologist Marc Schulz, the Harvard Study’s associate director, investigated findings from 47 married couples in their 80s.
Couples with greater marital satisfaction were better able to cope with the adverse effects of poor health on happiness. In contrast, those unhappy with their marriages were more likely to suffer unhappiness from health issues.
In essence, fulfilling relationships may serve as buffers against life’s stresses and anxieties.
Nonetheless, some critics argue that the study’s results may be simplified and primarily reflect the experiences of a small, mostly White cohort in the United States during a specific historical period.
Defining what constitutes a ‘good’ or ‘satisfying’ relationship is complex, and linking these emotional states directly to health outcomes poses a challenge.
While there may not be a universal formula for health or happiness, this extensive study offers valuable insights.
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“The original founders of this study would never have believed that I’d be sitting here today telling you that our scientific work is still going on with these same families,” Waldinger expressed in a 2024 interview.
As it enters its ninth decade, the Harvard Study of Adult Development aims to continue its exploration, accumulating new data to help “people live healthier lives filled with meaning, connection, and purpose.”
That’s certainly a reason to smile.
