The common theme on this board is "I use over a gram of test a week...and still look like I barely train..so any of the guys in the 60's like Larry Scott who used well under 50 mg of D-bol a day and looked twice as impressive as I'll ever be.. are God damned liars!!"
Perhaps some are insecure,
but Draper is not completely honest. He is reluctant to talk about it obviously. Maybe he's insecure, maybe he doesn't want drugs to take any credit for his physique, like LATS said. Does he look natural in the pic posted to you? Had he been honest he would've said something like, "In the 60s I cycled steroids, mostly used Durabolin with an oral. In the 70s I was whacked out of my mind on angel dust and booze and can't remember how much I used exactly.

I kept using steroids and am still on them to this day. These days it's testosterone with some GH and I don't go off, what's the use at my age? I love steroids - they allow me to feel and look great. I have many decades worth of steroid use under my belt and know a lot about their application".
Instead he's reluctant and acts like he doesn't remember - like it was a youthful indiscretion only.