The HELL you say?
People don't grow between 18-23, especially if training with one of the best camps in the world. They simply gain a couple pounds because young athletes in growing bodies are very limited to the amount of size they can gain.
I used to think that too.
That if a person lifted weights from a young age it would stunt their growth.
As far as I know, its a myth and its been busted.
Not the best source, but best I could find: