maybe he should try to socialize with people his age
not to be mean, but this isn't healthy
That would imply that every person he wants to socialize with would need to learn sign language. Cubelands may not even be able to write I don't know.
Also fun fact; most deaf people can't read or write, which is why they had to create sign language. Learning written English/whatever language they sign in is a good feat for a deaf person.
But that's only an excuse for his grammar/english. Personality I have no idea.
I would have to agree that it probably isn't the best thing to hang around young kids all the time if you're over 40. (Hint: It lowers your IQ!)
I'd imagine the only people that he can talk to without typing it would be close family members/friends that learned sign. Talking to the same people you've talked with regularly for 40 years isn't quite productive.