This is Dorian at 20-21 years old I believe (born in 1962).
I know he had freak genetics, but 6 months?
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I had a similar amount of muscle mass (and bodyfat) after my first 6 months of serious lifting. I screwed around in high school, but didn't really gain any weight (maybe 10 lbs, but most of that was just natural growth from being a teenager and getting older) because I didn't train or eat for bodybuilding.
At age 22 (the same age Dorian is in that pic) I decided I wanted to train for bodybuilding, at which point I pout together a well thought out diet and training protocol. I went from 167 lbs (at 6'1) to 208 lbs in just 12 weeks...with roughly the same BF percentage...drug-free. It was a 41 lb gain. I used creatine and a weight gain supplement called Mega-Mass 4000. That stuff was total crap, but it did supply a lot of calories.
I got WAY stronger during that time (went from benching 226 X 6 to 315 for reps, added a couple hundred pounds to my deadlifts and squats, and increased all other lifts similarly) and looked pretty much what Dorian looked like there. Of course, my shape was different, but development and leanness was similar.
I continued lifting for another 9 months after that--not quite as serious as the first 12 weeks--and managed to put on another 22 drug-free pounds, putting my one year weight gain at 63 pounds. I was benching 400+ pounds by then, doing overhead presses with 300 pounds, etc.
By the time I started taking AAS I had already decided I wasn't going to pursue competitive bodybuilding and never really trained anywhere near as seriously after that. I managed to gain another 45+ pounds, eventually putting me in the 270's (520 bench, 385 overhead press, 700 dead, etc), but I had no motivation to go past that. I knew it would require rigorous attention to diet and consistent training, but at that point I had already begun losing motivation for bodybuilding. As I got older the way I looked just didn't matter to me as much anymore. My wife and daughter...and their future...became a much bigger priority to me.
Had I dedicated myself to getting as big as possible I am sure I could've reached 320ish' or so. I never had the genetics (shape and structure-wise) to do well in bodybuilding, though. I would look at myself when I was benching 500+ lbs, overhead pressing near 400 lbs, doing barbell rows with near 400 lbs, etc...and I didn't look anything like the pros, many of whom were significantly weaker than I was. Being 6'1 definitely had a lot to do with it. 6'1 guys generally need to hit at LEAST 320 in the off-season--lean--in order to do OK in competition. Even if I had gotten there, I had too many imbalances and relatively poor shape, so it wouldn't have mattered for me. For example, the biggest arms ever got, even when I was in the 270's, were 19 7/8 inches, yet my chest was as big as some of the pros I knew, and looked good too. I had full, round, hanging pecs like Arnold, Haney, or Coleman (similar shape). They weren't as big, of course, but they were much better than my arms. Imbalances and bodybuilding do not go well together.