Don’t most Alzheimer’s patients live in the waaaaay past.....my grandmother did. I took family pictures when I went to see her......she didn’t know who I was, but she knew who her parents were.....so it doesn’t surprise me that an Alzheimer’s patient would revert to teenage behavior.
Sort of. They do, but they have moments of pure lucidity. So you can come in & say "Hi, Daddy!" and there is a chance they'll say "Hi" back, but there is just as great a chance they won't and will be elsewhere mentally and "Hi, Daddy" will upset them because in their minds, they are not "Daddy", and why are you calling them that? So you never know what helps at any moment, and what will upset the person greatly. Sometimes they'll react by wondering why you aren't calling them "Daddy" & are being disrespectful calling them by their "real" name. So you edit everything you say until you can figure out where they are mentally at any moment. And sometimes nothing helps. It is very difficult.
The last time I saw my great-grandmother she thought my father (her grandson) was her son just coming home from WWII. She finally recognized who he was for about 30 seconds and then reverted. Then she looked at me and my brother — we both had longish hair at the time — and asked “Who are these nice looking girls?”