Hi...welcome to paw talk.
8 years old is kind of old to be rehoming him. He's probably very use to you and set in his ways. Rehoming rabbits can be pretty hard on them, especially if he's been living with you that long.
If you really must rehome him and can't find him a new home yourself, you could take him to a rabbit rescue/shelter and hope that they can find him a good home. Here's one I found just by doing a google search. I don't know if any of them are near you, but you could do your own search to find others if need be.
And in the future, if you post on any other forums/websites to try to find him a new home, more information would be helpful. Is he fixed, how is his health, what does he look like, pictures if you have them, his temperment/personality, is he good with other rabbits, children, other pets...things like that.
Good luck, I hope you can find him a good new home.