dude, he wants to be a pro-bodybuilder, period. if he waits to be 25 his career is over before it ever began. In BB they all start as amateurs and ya gotta finish certain shows in the top 5 some top 3 others ya gotta win to qualify for the next level of BB show. Ya gotta qualify to go to the show ya gotta WIN to gain your pro-card.
if he waits to be 25 to start - his career is already over.
powerlifting it's fine and I recomend waiting as long as you can, your right about better gains after reaching natural peaks, blah blah blah.
BUT HE WANTS TO BE A PRO BODYBUILDER!!!! Not some big gym rat who's almost 30.
He waits, he loses, the dream will never have a chance of becoming a reality.