||The screening of frailty can trigger interventions aiming to delay disability in older people. Whereas the prevalence, the consequences, and the factors associated with frailty are well described, little is known about the duration of the state of frailty. This study aimed to estimate the time spent in the state of frailty in men and women using the Sullivan method. Data used were the age- and sex-specific prevalence of frailty found in SIPAF study ("Systeme d'Information sur la Perte d'Autonomie Fonctionnelle de la personne agee") and statistics of mortality from the Human Mortality Database. The SIPAF study included 2350 individuals aged 70 and over and living in France. Participants were interviewed at home by trained nurses. Frailty was defined as impairment in three domains or more among nutrition, energy, physical activity, strength, and mobility. People requiring assistance in basic activities of daily living were considered in a separate category. Mean age of the study sample was 83.3 +/- 7.5 years, with 59.4% of women. Overall, the prevalence of pre-frailty, frailty, and dependency was 39.1, 17.0, and 15.4%, respectively. Life expectancy at age 70 was 18.3 years for women, of which 7.4 years (95% CI 6.9-7.9) were pre-frail, 3.4 years (95% CI 3.0-3.8) frail, and 2.4 (95% CI 2.1-2.7) with disability. In contrast, LE for men at 70 was 14.8 years, of which pre-frail, frail, and disabled years were 6.0 years (95% CI 5.5-6.5), 1.2 years (95% CI 1.0-1.5), and 1.2 (95% CI 1.0-1.5), respectively. In conclusion, frailty is a transition state that is relatively limited in time compared to pre-frailty that may represent a larger time window for prevention.