Advanced Alzheimer’s restricts mobility. Ex’s G-father was bed bound for 20 years. Had no idea of the identity the women that visited him, fed him, washed him, talked to him, every day, for 20 years. (His wife.) He couldn’t talk, couldn’t focus, would panic when he saw what was, to him, a stranger. It was a horror show.
Our best scientists have sent space probes beyond our solar system yet they still have almost no clue what causes Alzheimer’s, let alone having any clue about a possible cure for it.