Joe:

Congrats on your moment in the sun! I hope to enjoy it myself someday! As far as your questions...
I have noticed that growth hormone seems to reduce the gestation period of the fishies. I'm really glad you posted that question b/c I never remembered to ask it myself! I wasn't sure if I was loosing track of time and just thought it was speeding things up.
However, I have not noticed that some fishes are "born" 2-3 years old. If I had to guess I'd say those fish were babies that you didn't notice before you applied the chemical. Those little guys are very small and seem to enjoy to hide.
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Have you hugged your Golden Grouper today?