I'm glad I waited, although maybe not as long as I did(ten years of natural training). I was 140 at around 5'9' when I started, and was able to get up around 200lbs naturally. Because I waited, after my first cycle I looked like most guys do after 5 cycles. I am now at 230lbs 10% bodyfat (have been as high as 240), but am still growing. Every cycle you do its going to get harder to grow. If you wait till you're close to your natural limit before starting, you can blow right past that natural limit. But if you have to do a few cycles to get to that natural limit, with the resistance you've built up to the steroids, think of how much harder its going to be to keep growing.
But in the end it is your decision and your decision only, no one else can tell you whats right or wrong for you
I hope that ramble made sense....