I'd like to see it on the market while I still know who I am.
Jokes aside, I had a great aunt with Alzheimer's and can't imagine 1. being elderly yourself while caring for an elderly loved one with Alzheimer's, and 2. not knowing who my son is/my son not seeing any recognition in my eyes. This has to be as devastating for the family as it is for the victim.
It's very difficult. Where my parents live in Florida, many older men and women are caring for a spouse with Alzheimer's. There's one man on my parents' street who can't remember where his house is, if he gets out the door, and many of the neighbors have experienced his turning up at their doors, asking whether it's his house.
Eventually, of course, the suffer doesn't have any frame of reference to understand what's happened, and then the hardship is really for the other family members.