Using AAS at 16 = abusing AAS. You may not understand why but 25 isn't an arbitrary age invented to keep young people off juice. There are very important biological and physiological reasons why you shouldn't use AAS at a young age. You can find many people explaining why. Go read up on why you shouldn't use AAS at a young age. It's not a "risk". It's a guaranteed way to screw yourself up, shrink your nuts, give you secondary Hypogonadism, ensure a lifelong need to be on TRT and all the shit that goes with that and most importantly, you won't keep any of your gains because you haven't reached natural potential. Reach natural potential first, learn everything about lifting and nutrition then some years after your peak natural testosterone production - early 20's at an absolute minimum - if you've reached a plateau that you can't break through, then you could start learning about AAS.