I´m training for 25 years now....."and know both sides of the game", first 15 years "natural", following three years 1 12 week steroid-cycle once a year. I quit the steroid-use 7 years ago, because i don`t like the feeling of "training hard as ever & get weaker at the same time after the cycles ".
So after that i worked up 100 % naturally and "slowly but steady" i started to progress a few month after i quit with the steroids (Deca, Dia).
I`m now 43 years old, "never miss one of my 4 weekly workouts", and been as massive & strong since never before in my "natural-career". I don`t know how long i will further progress, but one thing is for sure,
"i train until to the point i can walk by myself into a gym"
sorry for grammatic faults, i´m german....