I do not know anyone who has Alzheimer's. This question came to my mind when I was watching a video of an elderly man with Alzheimer's buying his wife flowers on Mother's day. His wife thought he was missing and reported to the police. Police tracked him down 2 miles from home walking and he was not ready to return back home until he got flowers. Police helped him pick bouquet and then dropped him back home.
I was so moved by the story and it got me thinking.
One of my neighbours probably has Alzheimer's. I say probably because his wife went through a whole lot of trouble to get him to have tests and things, but then when she finally got the appointment, he refused to go. So although he has not been officially diagnosed, he very likely does have Alzheimer's.