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What percent of 80 year olds have dementia?

According to Alzheimer's Association data, about 13.2% of people aged 75 to 84 have Alzheimer's dementia, and this percentage increases dramatically with age. However, the specific question of what percent of 80 year olds have dementia requires looking at slightly broader age brackets to draw accurate conclusions from current epidemiological data, which reveals a significant and accelerating prevalence rate for dementia in this demographic.