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[–]chottohen 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

People in their late fifties might suffer from early-onset dementia but it is not common. By age 78 some dementia is common. On the other hand we can say that some people in their twenties have never been able to think clearly.