Old Goat, at 90, you are posting here which says you are still able to do some things even though you are having to rely more on your family. I say well done!
My Father turns 90 this year too. He cannot post on the Interwebs. He cannot toilet, bathe, dress, or feed himself. He is no longer able to carry on a conversation. I, too, love my Dad even though I do not like some of the things he did that hurt the family when he was zealous in the cult. He is no longer capable of being a zealous witness as his dementia is slowly robbing him of his abilities. One day, he will die because of this disease.
I was speaking to a colleague of mine yesterday. I told him my Dad has dementia. He said "Well I hope things get better for him." I said "No, he will die from this disease." My colleague said "Don't think like that." I said to him "You don't get better having this disease."
All that matters now is to be his advocate, be kind to him, and show him love. This is what is important now. Love is very powerful as it transcends the dementia barrier.
THIS is truth... THIS is reality.