Relatively rare in younger seniors, dementia as prevalent as heart failure at 80+

Dementia rates increase with age. While the prevalence rate of heart failure (a chronic condition that develops after the heart becomes damaged or weakened) among seniors age 65 to 79 is more than twice the rate of dementia (5.9% versus 2.5%), dementia is as prevalent as heart failure among seniors age 80+.

Source
Public Health Agency of Canada. Public Health Infobase: Canadian Chronic Disease Surveillance System (CCDSS). Accessed February 28, 2018.
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