I don't buy much into the genetic plateau, i've never seen someone at a level where it was impossible to make natural gains. It becomes increasingly harder, but few people have diet/training/lifestyle that are all 100% perfect (especially diet) so there is always room for improvement.
Way I see it is you should have been lifting seriously for a few years, enough so that the natural gains have slowed down to a trickle. I.E. if you can run a natural bulk and gain a significant amount of quality LBM, you're not ready.
It's simple to figure out if someone has pushed far enough... like at 6'1 180 lbs, you are too small. People complain about being ectomorphs, pretend their caliper test that said 5% BF is correct when it's not, and otherwise make excuses to start too early. While I'd always advise heavily against it, in the end of the day I believe everybody should make their own decisions and take responsibility for them.
I.E. you don't do your research and you fvck up, you deserved it.
I sat on a bottle of Superdrol for 2 years before using it... I would say patience is a virtue when it comes to this stuff.