The relative impact of ontogenetic and sociocultural change on life satisfaction over the adult age-span (ages 30-73) is investigated. Independent random-sampling data are examined for changes occurring over a four-year period, with tests administered in 1973 and 1977. The results of an age x time measurement x race time-sequential analysis and a cohort x time of measurement x race cross-sequential analysis reveal that generational differences can account for a greater proportion of the variability in life satisfaction than can age differences. Racial differences and time of measurement differences in life satisfaction also are examined. The implications of the findings for future research in the area are discussed. (Author)