There are some classical examples where the mind fading away is able to express its own deterioration before the damage is too much to express anything.
At this point there is no answer to a simple question to the subject:
Who are you?
Who are you?
Whoever he was, its gone longe before his body ceases to function.

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Some great fictional stories are opening by amnesia (but rather not alzheimer ) , im thinking about those parralles playing Disco Elysium (protagonist start with no memory after self inflicted chemical damage) .
This is tragedy of course in reall life, but in fiction it gives possibility to learn world by reader/player/viewer at same pace as main character.
Examples :
"Nine princess of Amber" - Roger Zelazny's first volume of Amber chronicles.
Harry Angel movie based on novel by William Hjorstberg "Falling Angel"
Planescape Torment
True Detective (Season 3) ...
also question "who I am" is rather fundamental classic one even for healthy person.
Thank ypu for shaing this entry . : ) anyhow , seems like I've needed some excuse to put those examples somewhere.