Whasup, im going to disagree with you on that on stevesmi( not promoting steroids for early age) , but androgen therapy or in this case steroid use in stage of puberty will only cause the hpg axis to mature at a faster rate or cause hpg axis maturity. This will however upon cessation lead to the normal functioning of endocrine system in that department to which gene's are precribed. Only lasting effect is if atrophy was prolonged , if steroids were used for a very long time, permanent alteration would be the cause leading to the onset of lower sex hormone secretion, but im talking high doses for a long period. This has been studied thourougly and several studies support this on the fact that alot of teenage boys have delayed pubertal onset, alteration at cellular level may occur to an extent but this goes with prolonged use. Also cases have been found that after cessation of exogenous testosterone some individuals can take up to 5/10/15 years to fully recover to homeostasis.