WOW!!! 20?!

Remember Chick started training when he was fairly young, like 14 or 15. So he had around 5yrs before he would have hopped on gear when he turned twenty.
You'll also notice he did not say that he took his first shot @ 20yrs old, just that was the age he decided that he could consider taking something.
Far cry from these days, when someone is looking at Cutler in a magazine, trains for 7 months while eating everything in sight, and when they're aren't big (but fat) they load up on gear. Having never learned to properly train, eat or diet, they get big, bloated, acne and eventually burn out. I've seen it countless times over the years.