Subjective well-being is often characterized by average stability across old age, but individual differences are substantial and not yet fully understood. This study targets physical and cognitive health and personality as individual difference characteristics and examines their unique and interactive roles for level and change in a number of different facets of subjective well-being. We make use of medical diagnoses, performance-based indicators of physical (grip strength) and cognitive functioning (Digit Symbol), and extraversion and neuroticism and apply parallel sets of multilevel growth models to multiyear well-being data obtained in the Berlin Aging Study 2 (N= 1,216; M age= 71; SD= 3.84; 51% women) and the German Socio-Economic Panel (N= 3,418; M age= 70; SD= 6.89; 51% women). Results revealed by and large average stability of life satisfaction, morale, and emotions (anger, fear, sadness, happiness) across old age. Most important for our research questions, higher morbidity, poor performance on grip strength and perceptual speed tests, lower extraversion, and higher neuroticism were each uniquely associated with lower life satisfaction, morale, and positive affect and higher negative affect. Some evidence emerged for facet-specific health–personality interaction effects in predicting affective experiences, but effects observed were not consistent across studies and of small size. We take our findings to indicate that health and personality traits constitute important individual difference characteristics for our understanding of subjective well-being in old age and that these likely do not interact with one another to shape well-being. We discuss theoretical and practical implications.(PsycInfo Database Record (c) 2022 APA, all rights reserved)