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Aging is the primary risk factor for frailty, which is defined as an inability to respond to acute or chronic stressors. Individuals are living longer with greater multimorbidity, but there is a paucity of evidence examining frailty across birth cohorts and ages.

We investigated frailty prevalence and its association with mortality at ages 75, 85, and 95 in the 1895–1945 birth cohorts in Sweden with data from population registries. Frailty was assessed with the Hospital Frailty Risk Score (HFRS).

We observed that frailty increased with increasing age and that it has become more common in more recent birth cohorts. At age 75, the percent frail in the Total Population Register increased from 1.1% to 4.6% from birth cohorts 1915–1945, corresponding to calendar years 1990–2020. At age 85, the percentage of frail increased from 3.5% to 11.5 …