Results of previous investigations of life satisfaction in the aged have suggested that health, socioeconomic factors, and social interaction are most strongly and consistently related to life satisfaction. However, a great deal of variance in life satisfaction remains unexplained. Men (N=19) and women (N=21) aged 65 years or older were interviewed using the Life Satisfaction Index A and a measure of ego development in order to investigate the role of ego development in accounting for life satisfaction in aged individuals. Analyses of results indicated that people functioning at the post-conformist level of ego development were more satisfied with their lives than those at the conformist level, and that ego development increased the predictability of life satisfaction when combined with the known predictors of health, activity and social participation, and socioeconomic status. The increased predictability of life satisfaction suggests that it may be useful to further explore the contribution of ego development and other psychological variables to life satisfaction. (JAC)