Well you could always just clean his house for him. Not that I think you’re his maid or that you are required to but it does alleviate the problem. I mean, dude is 60…you can’t teach an old dog new tricks.
The alternative is you just don’t go over there. Invited or uninvited. It’s your choice. That might torpedo the relationship, but that’s an option.
My guess is that you knew what you were getting into at some point. And you decided to move forward anyway. Chances are he ain’t cleaning anything in that house so if you want to continue seeing him, then you should just find the path of least resistance.