Dementia is a general term for loss of memory, language, problem-solving and other thinking abilities that are severe enough to interfere with daily life.
Dementia and changes in abstract thinking
Dementia and poor judgement
Please leave my good friend Jim out of this 
Arkie, I hope dementia doesn’t involve misspelling the word dementia. 
As for the Hoppers comment, he speaks for himself. My mind is clear and my intellect is clearer.