Heaven, I am sorry your dear Dad has dementia.
I hope your dad still has friends and gets company.
Whether a person has dementia or not, as you say, once one stops the hectic paced JW life, no matter what their past decades performance was, they are now yesterday's toast.
Normal, outside people would not understand why an older aged JW person would think they would not die?
Normal people know from an early age, that all living things end.
I came to that wake up moment of clarity at age 62.
Sounds silly, but true.
(((Hugs))) to your dear Dad from me.
LoisLane