Actually I wouldn't be surprised if Arnold was natural into his twenties. Remember
Arnold is like the all time freak. Yeah, he always had a pretty good body but
he wasn't Mr. O from the minute he showed up in America. His first trainer
in America was Vince Gironda. Arnold walked up to him and introduced himself
as the German champ, or Mr. Germany or something like that and Vince said
something like, you aren't anything but a fat bastard. Also remember that Arnold
had some fairly shitty legs and wasn't a whole lot heavier than 210 pounds in many
competitions. Also remember that Larry Scott won the first Mr. O on a couple of
d-bol a day. He had some of the first monster arms, over 20 inches. Don't let
people tell you that old timers did assloads of roids just cause they
were cheap and easy to get. They didn't understand back then how
much gear you could actually use without dying and many of them were scared.