OK, I have a dumb question...

This guy at work is pretty swole, been working out for 20ish+ years now and has been a great mentor and resource when it comes to working out. Well the other day I was asking him about his use of any supplements and he misunderstood my question which led to him admitting going on one cycle of 'roids many years ago. He claimed he had massive gains in both appearance and strength.

Now I didn't want to offend him by asking, and this is where the dumb question is, but how much of his current mass is natural after being off those for about 10 years? Or is the 1 cycle forever given him those gains such that he appears big since he continues to workout every week?

I'm no expert, but I don't think it has anything to do with the steroids use many years ago. As far as I was aware, mass due to steroids disappears pretty quickly when steroid use is stopped. I think there are two possibilities:

He has decided to stop using steroids and is doing it naturally.
He is still using steroids and won't admit it.