Exactly - there are things that I would change now to make sure I make thing easier for myself and - more importantly - easier for the people around me.
I am absolutely not going to plan on a care facility right now. That sounds absolutely bogus.
If I were likely to develop alzheimer's, I'd make more and more expensive accommodation for power of attorney and trusts to shield assets while I was competent to do so.
Knowing an early, painful fate allows you to approach it with dignity.