Information provide by Alzheimer's Research UK about early onset Alzhiemer's. Alzheimer’s is a disease that causes dementia. It is the most common cause of dementia, accounting for about two-thirds of cases in older people. Although often thought of as a disease of older people, around 4% of people with Alzheimer’s are under 65. This is called early-onset or young-onset Alzheimer’s. It usually affects people in their 40s, 50s and early 60s.
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