Self-perceptions of aging, important indicators of successful aging, are closely linked to health. Previous research has mainly examined the role of individual factors on self-perceptions of aging, but health is partly dependent on contextual factors such as primary care supply. This study therefore examined whether the impact of diseases on self-perceptions of aging is buffered by primary care supply in the district, as it ensures sustained health care continuity. Nationally representative German survey data on health and self-perceptions of aging (N = 4,442, 40-85 years) were linked to primary care supply (general practitioner density in regional districts). Multilevel modeling shows that the impact of disease burden (multiple illnesses) was buffered by primary care supply: Disease burden was less strongly associated with negative self-perceptions of aging in districts with good primary health care supply. This underlines the importance of health care resources for successful aging.