Objectives: Many studies have demonstrated that theory of mind (ToM) ability declines with increasing age. Research has found that ToM-age associations are often mediated by other cognitive abilities particularly executive function. However, older adults rarely complain about real-world ToM difficulties.It has been suggested that older adults may perform better in real-world situations compared to experimental settings.Methods: We examined performance on the Strange Stories Film Task (SSFT) which has been designed to assess ToM using naturalistic, video scenarios. Sixty adults aged between 17-95 years old completed the SSFT, inhibitory control (Stroop) and working memory (Letter-Number Sequencing) measures, the basic empathy scale (cognitive and affective empathy), and the broad autism phenotype questionnaire.Results: ToM performance correlated significantly with age, whereas performance on a control task did not. Partial correlations and stepwise regression analyses demonstrated that performance on the three SSFT ToM measures was explained by a combination of executive function and empathy measures, with age explaining none of the variance.Conclusions: Using a naturalistic test of ToM, performance was shown to decline with age for ToM but not control scenarios. Across the lifespan, the variance in ToM performance was explained by cognitive abilities and empathy but not age. Age alone may not influence ToM ability, but may be associated with age-related changes in cognition and social-cognition. Theory of Mind across the adult lifespan Public SignificanceOlder age is associated with poorer ability to understand the mental states of others, although older adults ready complain about the quality of their social interactions. Using a video task of real-world scenarios, we found that although poorer theory of mind ability was associated with older age, performance was explained by other cognitive abilities. Age-related cognitive difficulties rather than age alone may explain changes in understanding others in later life.