Lifestyle Choices Explain Only a Small Part of Socioeconomic Longevity Gaps
A new analysis uses mediation methods to examine why higher socioeconomic status tracks with longer life and healthier aging. In a 20-year study of 33,541 Chinese adults aged 65 and older, the researchers assessed how much healthier habits such as not smoking, diet, weight, and exercise account for these disparities. The findings suggest that lifestyle explains only a modest share, leaving factors like pollution, infections, and medical access as likely contributors.
The study followed 33,541 Chinese adults aged 65 and older for two decades across 23 provinces. Researchers grouped participants by education, finances, and occupation, then scored habits including smoking, heavy drinking, physical activity, leisure activity, and diet.
Low-status participants faced higher adjusted risks of death from any cause and unhealthy aging than high-status peers. Healthy habits accounted for about one-fifth of the mortality gap and one-sixth of the unhealthy-aging gap. The healthiest groups gained more years of total and healthy life at 65, with larger gains in higher-status groups. Air pollution, infections, and medical access may also matter.
This analysis may shape how clinicians, policymakers, and communities think about healthy aging. It suggests that encouraging better habits remains useful, but may not close socioeconomic longevity gaps on its own. Older adults in lower-status groups could benefit most from broader improvements, such as cleaner air, reduced infection exposure, and better medical access. Researchers and health organizations may use these findings to support combining individual prevention with environmental and health-system measures, though the study cannot prove causation.