While chronological age is objective, subjective age refers to a person’s subjective perception of their age, which differs from person to person. Physical, psychological, and social context factors influence subjective age on the one hand; on the other, younger subjective age has positive effects, and older subjective age has negative effects. From the perspectives of temporal explanations, age discrimination, and individual beliefs, this paper introduced three significant theories of subjective age. Based on the three theories, an
entirely novel integrative theory termed the multidimensional, multitemporal, and ecological framework was also presented. Based on this foundation, the paper makes four key recommendations for future research: distinguishing state and trait subjective age, using multidimensional or unidimensional measures, combining psychosocial and physiologically relevant theories, and investigating more nuanced, contextual questions.