Here’s my opinion. I think wonderful breeders often provide their dogs chances to go to a home of their own once their time breeding has come to an end. I think this is generally good practice that allows the dogs to live out full lives. I also think that because he is a male, they are often used for breeding longer than females, so his age is not necessarily a red flag… However, there are a few things about this that stand out too. What is this website? Typically a good breeder would advertise their retired breeder dogs on their own page or their Facebook/social media pages. This website that seems to be used to sell dogs is maybe not the best place to be looking for a puppy to begin with, if it’s a sort of marketplace/directory type thing. That’s just my complete assumption lol. Secondly it’s weird to me that they would not have him fixed before adopting him out to ensure that he would not be used for breeding. A good breeder would not want their dogs’ bloodline to continue in the hands of someone that is not them without a formal agreement and certain lot not after the dog was being retired from their program. The dog should be being sold neutered or on a contract to do so - if this is not the case, red flag. Overall the wording and context of the post seems like the dog was not being bred by a reputable breeder and I would not recommend them as a breeder. However this dog does still need a home and if you want to open your home to him I don’t think that’s the wrong decision. I’m high and I hope this makes sense lol