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(Pathology) a form of dementia, of unknown cause, starting before a person is old
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|Noun||1.||presenile dementia - dementia with onset before the age of 65|
Alzheimers, Alzheimer's, Alzheimer's disease - a progressive form of presenile dementia that is similar to senile dementia except that it usually starts in the 40s or 50s; first symptoms are impaired memory which is followed by impaired thought and speech and finally complete helplessness
Pick's disease - a progressive form of presenile dementia found most often in middle-aged and elderly women and characterized by degeneration of the frontal and temporal lobes with loss of intellectual ability and transitory aphasia