i did my first at 24, i dont' know it was mild cycle of winstrol and i had no clue what i was doing so it did nothing, i agree though, but if someone has completely plataued like i did, certain ectomorphs just can't put on weight, then i don't see a problem if they are fully grown, i asked a doctor, i feel if you gonna do it do it all the way, tell you doc, do blood work, and if you really can't get any bigger do 6 months of research and then start a cycle, i wish i had done it that way cause my second REAL cycle i gained 22 lbs because i understood diet and pct, and that steroids are not magic