I think it depends on your dog. I know people who had 7 month old puppies that passed, no problem. The puppies were very easy going, loungy dogs though, not exactly active, interested, drivey dogs. My male is 17 months old, almost ready for the BH, and the one thing that stops me from having him tested is the sitting politely for petting (if someone makes a fuss over him, he will break his sit and jump every time) so until I decide that it's very important to me to break that, I'm going to have to wait. On the other hand I had a rescue that practically came from the shelter ready to take her CGC. It was just her personality.
I think the majority of the test hinges on a good sit stay, a dog that is comfortable with handling, and basic loose leash walking. I think a year is a good time for the CGC, but as soon as you think you can do the exercises I would consider trying it out, also many trainers or local kennel clubs offer classes to prep and run you through the exercises.
Where in Florida?