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Psychological well-being has been linked with better health, but mostly with cross-sectional evidence. Using MIDUS, a national sample of US adults ( N  = 4963), longitudinal profiles of well-being were used to predict cross-time change in self-reported health over 9–10 years. Well-being was largely stable, although adults differed in whether they had persistently high versus persistently low or moderate levels of well-being. After adjusting for sociodemographic factors, those with persistently high well-being reported better health (subjective health, chronic conditions, symptoms, and functional impairment) across time compared to those with persistently low well-being. Furthermore, persistently high well-being was protective of improved health especially among the educationally disadvantaged. The findings underscore the importance of intervention and educational programs designed to promote well-being for greater segments of society.