Find out what he likes to eat. If he can't get around much and he doesn't have anyone to go out for him, he probably can't get his favorite snacks very often.
Get him one of those grabber things to help him pick things up off the floor. My old grandmother can't live a day without her heating pad because of her arthritis. Anything that you would look at and say, "Wow, that looks really comfortable" would work, too. From what I understand, everything hurts when you're old, so the more comfortable everything is, the better.