presenile dementia
presenile dementia n dementia beginning in middle age and progressing rapidly compare ALZHEIMER'S DISEASE

* * *

dementia in persons not classified as elderly, usually meaning those aged 65 or younger; since most cases are due to Alzheimer disease, the term is sometimes used as a synonym of d. of the Alzheimer type, early onset, and has also been used to denote Alzheimer disease.

Medical dictionary. 2011.

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