The Frailty Index (FI) is a measure of frailty with recent guidance on its calculation. Objectives were: 1) To determine the prevalence of frailty and its component domains at different ages in older men; and 2) To determine if the FI, and/or its component scores predict death or long-term care (LTC) admission. Design: A cohort study. Setting: Most of the participants lived in Canada. Subjects: 3,983 men who qualified for air crew training during the Second World War. We included 1,711 men (mean age 76) free of dementia, living in the community, who had data to construct a FI in 1996.