H igh-quality surgical outcomes require sound knowledge, communication skills, clinical judgment and technical proficiency. 1 Aging of the surgical workforce has been well recognized; however, the effect on patient outcomes is unclear. 2,3 The effect of aging, namely cognitive impairment, decline in visual acuity and worsening motor function, may negatively affect surgical ability. 4 However, age-related decline may be offset by the older surgeon's years of clinical acumen, surgical experience and clinical judgement. In addition, because surgeon volume is associated with improved surgical outcomes, 5,6 it is unclear whether surgical volume may offset age-related effects. Thus, surgical volume and age-related effects need to be evaluated concurrently. 7,8 Published evidence about the effect of physician age and experience on surgical outcomes shows mixed results. 9-11 Among Medicare beneficiaries undergoing pancreatectomy, coronary artery bypass grafting and carotid endarterectomy, mortality was higher among those treated by surgeons older than 60 years, especially those with low volumes. 12 This was corroborated in subsequent studies of particular surgical procedures. 13-15 In 2018, an observational study involving patients in the United States who were Medicare beneficiaries reported that patients who were treated by older surgeons had lower rates of mortality than those treated by younger surgeons. 16 However, these data lacked generalizability because the study included only a limited number of nonelective surgical procedures in patients 65 years and older and failed to inform the safety of older physicians performing most surgeries, elective procedures. We aimed to fill these knowledge gaps by assessing the association between surgeon age and outcomes across a broad range of patient age, surgical specialties and common procedures, while adjusting for surgeon volume.