Hey Wally I have an Uncle who is 72 and is suffering similarly. I go to feed him twice a week and am thankful for the time to do it. He and I have been close as you two have been.
Since you two enjoyed a common interest, I can assure you that he knows how much you care. You know, us guys normally don't need to verify it verbally.
If you're looking for something to do for him, make physical contact and talk to him when you visit. Something as simply as holding his hand and telling him what you did for the day. I believe these two easy gestures go a long way.
God Bless you.