I think that many breeders would think that with his experience, he would be ideal for one of their older dogs that they may be thinking of rehoming.
I give my dogs a good 'dog home' but if a person like your Uncle comes along, and can give them one-to-one attention, then I seriously consider it.

If you contact a Golden Retriever Club secretary or two, there will be a lot in the country, then they may well know of someone who would love to meet him.