use responsibly and you can do it a long time no problem.
it is what you do BESIDES steroids that determine this. many older dudes that use steroids have been in the grind a long time and eat very well and exercise so that will skew the numbers across the board.
I mean aslong as your lifestyle can match in terms of quality of life and overall health. Dont see it being an issue at all. I have seen guys in the 70's looking incredible!