doctor holding a card with alzheimer`s disease diagnosis. senior eldery aging healthcare concept

21 aging alzheimer alzheimers anatomy background brain card care caudate clinician concept degenerate degenerative dementia diagnosis disease doctor dopamine elder elderly eldery emotional gloves hand head health healthcare holding human hypothalamus illness intelligence keeps medical medicine mental neurologist neurology neurons old parkinson patient reasons senior shaking shows stethoscope striatum stroke substantia symbol symptoms text tremor world