The aged brain.
D000368:Aged; D000375:Aging; D000544:Alzheimer Disease / Q000473:pathology; D001921:Brain / Q000473:pathology*; D001927:Brain Diseases / Q000473:pathology; D006801:Humans; D006850:Hydrocephalus, Normal Pressure / Q000473:pathology; D008875:Middle Aged