Which predicts longevity better: Satisfaction with life or purpose in life?
Level 3 - non-randomized controlled study
Prospective observational cohort study with long-term follow-up
PubMed 38358729 · doi:10.1037/pag0000802
What was done
Analyzed longitudinal data from the Midlife in the U.S. (MIDUS) study (N = 5,993) with 23 years of follow-up. Using Cox proportional hazards models, researchers tested whether purpose in life or life satisfaction better predicted prospective mortality, evaluating them both separately and simultaneously with adjustments for demographic factors, health-related variables, and self-rated health.
What was found
The abstract does not provide numerical hazard ratios or confidence intervals. When analyzed separately, both life satisfaction and purpose in life significantly predicted mortality. However, when entered simultaneously alongside self-rated health and covariates, purpose in life remained a robust predictor of mortality, while the effect of life satisfaction was attenuated to marginal significance.
Why it matters
It distinguishes between two core dimensions of psychological well-being, suggesting that active engagement and purpose have a more direct and independent association with longevity than passive satisfaction with one's circumstances.
Limits
The abstract reports no numerical effect sizes, death counts, or exact p-values. The study is observational, precluding causal inference, relies on self-reported psychological measures, and is restricted to the demographic profile of the U.S. MIDUS cohort.
Cited by
- partial Among adults aged 70 and older, having a strong sense of purpose in life is the single most important psychological predictor of longevity.