What Matters When? Age-Related Reweighting of Life Domains in Life Satisfaction

Life satisfaction reflects not only lived circumstances, but the standards used to evaluate them. Using long-running UK panel data with repeated measures of life satisfaction and domain satisfaction (up to 13 annual waves; N ≈ 292,000 person-wave observations from 45,000+ individuals), this study examined whether the evaluative weight of core life domains changes across adulthood. Focusing on health, income, and leisure satisfaction, we tested whether equivalent within-person changes in these domains carry different implications for life satisfaction at different ages. Within–between (REWB) models, cohort-sequential age–period–cohort spline models, dominance analyses, and counterfactual predictions converged on a consistent pattern of age-related reweighting. Leisure satisfaction showed progressively stronger within-person coupling with life satisfaction across adulthood, accounting for an increasing share of explained within-person variance in later life. Income satisfaction predicted within-person change at all ages, but its relative contribution declined steadily with age. Health satisfaction remained a strong and stable predictor, functioning as a background constraint rather than an increasingly dominant evaluative driver. These patterns were not attributable to between-person differences, period effects, or mean-level domain change. Instead, they indicate systematic shifts in how domain information is weighted when individuals evaluate their lives. The findings challenge fixed-weight models of subjective well-being and suggest that life satisfaction is constructed through an evaluative system whose structure changes across the life course.