Dementia syndromes in the elderly.  Alzheimer's disease is most common, but other diagnoses are possible.
D000368:Aged; D000544:Alzheimer Disease / Q000175:diagnosis*; D003072:Cognition Disorders / Q000175:diagnosis; D003704:Dementia / Q000175:diagnosis*; D015140:Dementia, Vascular / Q000175:diagnosis; D003937:Diagnosis, Differential; D015577:Geriatric Assessment; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008609:Mental Status Schedule; D013577:Syndrome