... on a more serious note, my advice is to always wait until one is 21 and they are completely finished growing before they considering juicing. The only exception would be someone who truely wishes to, and has a realistic chance of playing in the NFL or some such sport. They really should be on something by age 16, if they want a reasonable chance of getting a football scholorship before graduating. Will if cause a great deal of damage to their body in the long run? Probably, but that's the nature of professonal sports, especially something such as football. Your body pays the price for your fame and fortune. I'm not justifying this, I'm only stating the obvious. For the rest of us, I stand by my original statement.