#presenile_dementia__preseniledementia  dementia with onset before the age of 65
  supertype:  #dementia__dementedness  mental deterioration of organic or functional origin
  subtype:  #Alzheimer's_disease__Alzheimer's__Alzheimers  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
  subtype:  #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

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