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Background and Objectives In older adults, executive functions are important for daily-life function and mobility. Evidence suggests that the relationship between cognition and mobility is dynamic and could vary according to individual factors, but whether cardiorespiratory fitness reduces the age-related increase of interdependence between mobility and cognition remains unexplored. Research Design and Methods One hundred eighty-nine participants (aged 50–87) were divided into 3 groups according to their age: middle-aged (MA; <65), young older adults (YOA; 65–74), and old older adults (OOA; ≥75). Participants performed Timed Up and Go and executive functioning assessments (Oral Trail Making Test and Phonologic verbal fluency) remotely by videoconference. Participants completed the Matthews questionnaire to estimate their cardiorespiratory fitness (VO2 max in ml/min/kg). A 3-way moderation was used to address whether cardiorespiratory fitness interacts with age to moderate the relationship between cognition and mobility. Results Results showed that the cardiorespiratory fitness × age interaction moderated the association between executive functioning and mobility (β = −0.05; p =.048; R 2 = 17.6; p <.001). At lower levels of physical fitness (<19.16 ml/min/kg), executive functioning significantly influenced YOA's mobility (β = −0.48, p =.004) and to a greater extent OOA's mobility (β = −0.96, p =.002). Discussion and Implications Our results support the idea of a dynamic relationship between mobility and executive functioning during aging and suggest that physical fitness could play a significant role in reducing their interdependency. [ABSTRACT FROM AUTHOR]