title: Dementia: definition and description.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D008875:Middle Aged; D019965:Neurocognitive Disorders / Q000175:diagnosis*; D009497:Neurotic Disorders / Q000175:diagnosis; D011618:Psychotic Disorders / Q000175:diagnosis; D009626:Terminology as Topic