While true, it is rare in the very elderly and almost unheard of in the ES dementia patients.
It surprises alot of people, but over HALF of my Alzheimer’s patients had NO OTHER significant health issues.... NONE.
My aunt had no medical history. She went to the dentist every six months. No cavities ever. She walked 3-5 miles every day up until six months before she passed.
If not for the AD, should could have lived well into her 90’s.