Thats bullshit.... The reasoning for not running steroids at a young are simply because of growth plates and higher levels of testosterone. Now I have seen studies where growth plates have been done at 18 and i have seen them at 26-27. Everyone is different. No matter what if your 25 you still shutting your natural testosterone down? So its just as damaging.....
OP how old are you? What are your stats?
Just preaching what i learn, dont want a debate, its saturday night, im no professer!