i think that's a big mistake people make in thinking that if someone takes steroids HE HAS TO BE A 250 POUND MUSCLEBOUND MONSTER!
which isn't the case, different juice does different stuff, i.e. makes you cut, lean, etcetera.
dude at my gym whose in his mid 40's only weighs probably 180 pounds but is clearly on some kind of juice, because not only is he under 10 percent or so bodyfat year round and does very little cardio, but he has that "grainy, paper thin" skin and his delts "pop" out big time, both are i have read signs of obvious juice use.