Can a black labrador puppy change in color as he gets older?

I obtained my male golden retriever when he was 13 months old. He was a surrendered pup from a family that found him too much work. Lucky for me they decided to do so. He came to me with a full coat. I belong to a golden retriever dog forum and the breeder was surprised to see his full coat. So, I believe it depends on the individual dog. My dog, Farley, has an awesome coat. I have no idea about his breeding but he obviously has great parents. I was surprised to find that he doesn't take a whole lot of grooming either. A good brushing once a week seems to be enough. His tail and leg feathers are lush and full and he will be going to the groomer soon to get trimmed up a bit for the summer. Can't wait to see him swimming.