It may just be a case that any teenager who takes steroids broadcasts it on social media making it seem like every teen bodybuilder is on steroids but there are hundreds of transformation videos on youtube of guys who are clearly using, here's just one example.
Even at my local gym the 17-18 year olds are getting bigger than the 25 year old natties who've been training for years
Even at my local gym the 17-18 year olds are getting bigger than the 25 year old natties who've been training for years