While the two are linked, I've not heard of deafness causing dementia, and you would expect a very strong correlation if that were the case. Since hearing occurs in the temporal lobe, the same part of the brain responsible for memory, meaning and language, I suspect it's just an early symptom of the temporal lobe failure.
Thanks.
I have hearing loss from work and don’t want to get dementia from it. Good reason to get a hearing aid, just to be on the safe side.