@kartwk, I think it’s a lot about expectations. When a person has cognitive decline the brain is not able to function properly. As dementia develops, the ability to correctly state facts is diminished. Their sentences may be nonsensical or like word salad. Older memories may stay for a long time or gradually fade. I wouldn’t expect accurate information or facts about history.

Everyone is different, but most people eventually have severe communication issues. Does your husband repeat things a lot? If not, I’d be prepared for it. It is one of the most challenging traits about dementia. Staying calm and patient when someone repeats something over and over dozens of
times with no memory of what they have said is not easy. I’d try to find a person who doesn’t suffer with these challenges to communicate everyday. Otherwise, it will really bring you down.