Lots of times vets and guys on boards say how young people are using gear. In general I would of course agree. However, something needs to be said (however controversial) to consider steroids at a younger age than some here would prescribe.
I'm 27 and have been blasting and cruising for a solid year off relatively low doses. My first prohormone cycle was at 25 and first AAS/pinning was at 26. Literally, my only regret is not pinning and switching to the dark side earlier on in life.
Think of the young IFBB/NPC stars, fitness models, athletes. They got on gear at 17-19. If Arnold or Jeff Seid had listened to people saying "wait until your mid-20s" to get on gear, they would have a much less impactful career. Jeff Seid would be unheard of since he's only 21.
Long story short: Get on steroids at a younger age, but only after careful research and mentors, years of training etc.