I think You first cycle should come when you reach a huge plataeu after about 3-5 years of hardcore training. And from the research that i have done now and from being a med student... you should def, not touch AAS until your over the age of 23... Diet and training should dictate really the perfect timing for AAS... personally i did them at deca at 250mg/ml per week at 19, young and dumb... No sides because of the low dose, but retained no gains... Then i waited for 4 years until i trained and lost weight... And was knowledgable. I figured once i had no more questions, i would cycle.... Learn everything you can before you cycle and get proper knowledge about PCT... And understand that what your doing is not natural and has consquences... Research is key to prolonging your health and making sure you dont fuck yourself up... Knowledge means everything....
Johnny