Changes in relative fitness and frailty across the adult lifespan: evidence from the Canadian National Population Health Survey

This is the authors' abstract. We don't add key points for this paper.

Deficits accumulated with age across the adult spectrum. At all ages, a higher Frailty Index was associated with higher mortality and greater use of health care services. At younger ages, recovery to the relatively fittest state was common, but the chance of complete recovery declined with age.