It has been ongoing trend for some time.
Tren is basically a meme, and some kids may fall for the meme and use tren, believing tren is a real magic. They won't use a testosterone base, by the way.
Some of them prefer SARMs or steroid cycle with oral steroids only and won't use a testosterone base. Some of them are afraid of the needle.
Anyway, kids on steroids is way more common than you think. But since they don't really understand how steroids work and that diet is important and you can't get big using only steroids without having a proper diet, they don't look like they are on gear despite the fact they are on gear, so you may think they are not on gear.