Well if we're going anecdotal, I'll direct you to older bodybuilders like Franco Columbu, Arnold, and Lou Ferrigno... all guys who obviously juiced, but not at the insane levels we began seeing in the late 80s (and continue today). If you want to see how the major drug use can pan out if done as well as possible, watch Dorian Yates and Ronnie Coleman. The only thing I've heard about Dorian is depressed testosterone... which is going to happen at 40-50 y.o. anyway, and I haven't looked too much in to Ronnie.
Regardless - the best way to take exogenous test is under a doctor's supervision, and that's currently not really allowed in today's environment. Unless, of course, you're a woman that wants to extreme cosplay as a man, in which case they'll hook you up. It's stupid. But with a doctor's care you could monitor your blood work to get out in front of any long term sides, and people wouldn't be inclined to get involved with the "wrong kind" of steroids.
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