I never knew that dogs turned gray until our beloved deep red golden, just like your Hurley, started turning gray around his eyes like a raccoon mask, then down to his nose. It started when he was about 6 but nobody could tell from his behavior that he wasn’t a puppy until age 13! Goldens are the best!
The beauty is that Golden Retrievers love you (and everyone, really) unconditionally and utterly. They are a fabulous role model for humanity but far too few ever take any notice. I could be happy spending my life throwing balls for Hurley and all his kind. Way better than the rate race to which almost all of us are so completely committed. Bloody mortgages!