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Almost half of new dementia cases occur in Asia, followed by Europe (25%), the Americas (18%) and Africa (8%). The incidence of dementia increases exponentially with age, doubling with every 6.3-year increase in age. [270] Dementia affects 5% of the population older than 65 and 20–40% of those older than 85. [276]
Overall, the lifetime dementia risk after age 55 was 35% for men and 48% for women. About a million Americans […]
The CDC said 1.7% of adults ages 65 to 74 reported a dementia diagnosis, a rate that increased with age. For those ages 75 to 84, the reported dementia rate was 5.7%
The prevalence of dementia increases in old age from about 10% at age 65 to about 50% over age 85. [93] Alzheimer's disease accounts for 50 to 80 percent of dementia cases. Demented behavior can include wandering, physical aggression, verbal outbursts, depression, and psychosis.
An estimated 10 to 20 percent of people age 65 or older with MCI will develop recognizable or diagnosable dementia within a year, according to the National Institute on Aging.
The ancient Greek and Roman philosophers and physicians associated old age with increasing dementia. [29] It was not until 1901 that German psychiatrist Alois Alzheimer identified the first case of what became known as Alzheimer's disease, named after him, in a fifty-year-old woman he called Auguste D.
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