Purpose in life, personal growth, life satisfaction and risk of cognitive impairment among older women.
Level 3 - non-randomized controlled study
Prospective cohort study
PubMed 42246930 · doi:10.1080/13607863.2026.2682977
What was done
A prospective cohort study examined 1,179 U.S. women (aged 77-93 years) from the Women's Health Initiative Memory Study - Epidemiology of Cognitive Health Outcomes (WHIMS-ECHO) cohort. Participants completed assessments of purpose in life, personal growth, and life satisfaction in 2012 and were followed annually until 2021 (average follow-up of 5.4 years). Cognitive status was evaluated with standardized assessments and central adjudication to detect mild cognitive impairment (MCI) and dementia. Mediation pathways involving perceived stress and physical activity were analyzed.
What was found
Over follow-up, 355 participants developed cognitive impairment (175 MCI, 180 dementia). Women in the highest personal growth quartile had a 33% lower risk of impairment (HR = 0.67, 95% CI: 0.46-0.96), showing both direct and indirect effects. The association between purpose in life and cognitive impairment was largely mediated (61%) by lower perceived stress and higher physical activity, rendering the direct effect non-significant. No association was found for life satisfaction.
Why it matters
It demonstrates that specific psychological well-being dimensions, notably personal growth and purpose in life, are prospectively associated with reduced cognitive impairment risk in late life, acting largely through lifestyle and stress pathways.
Limits
The sample was restricted to older U.S. women, limiting generalizability to men and younger cohorts. As an observational study, residual confounding and reverse causation cannot be fully ruled out, and psychological metrics were assessed only at baseline.