anyways I recall someone said on a forum he spoke with Kevin about steroids and dosaging and it seemed to him like Kevin didn't understand dosing and what mg numbers was what, what a CC was etc.
I think some guys don't measure things at all and just load up gear from time to time and inject at random when they feel like it and end up alot higher dosages than they claim 
then when someone asks they say whatever is established as norm and what sounds good.
A steroid course when young might not always be called abuse, especially if sides are tightly monitored. GH for example is given in some places even if you aren't a dwarf, just very short which will impact life negatively as a male.
Bodybuilders generally aren't really that interested in the steroids, they want them but don't care about the minutia, what mg their gear is. Today orals aren't counted towards the total usually even by the smart ones for whatever reason, say you like to pop 100mg preworkout of whatever is in the drawer, it's "nothing."
Teenagers should not be juicing especially not hard. The muscle on these guys who blast very young looks puffed up and fake, its not quality muscle which takes time.
Steroid muscle never looks quite the same

Younger teens can take 10mg of dbol a day for a month and get very visually obvious "muscle" and strength, I saw it in a few 14 year olds when I started. But I'm thinking of studies where 8 year olds were given 20mg of Anavar for a year and apparently didn't suffer sides and final height wasn't affected.