Interesting that you delete your previous post Mobil. Most guys will grow better naturally at a young age - fairly obvious I think. Therefore with a little gear it stands to reason that excellent gains can be made. Those gains will be all the more when you throw in some good genes like those guys photographed. Either way, gains will be relatively good for most at that age and in those circumstances, compared to what can be achieved with a similar protocol later in life.
Iv'e seen plently of guys in their early 20s who have gotten pretty big with a pretty lax approach to training and diet and using whatever gear the local dealer tells them to take. It is certainly a lot easier at a younger age. I would love to see more guys going pro young, guys like Gaspari, Arnold, Haney, Shane Dimora, Casey Viator, Shawn Ray et al. Now we have a bunch of old codgers with battered physiques
requiring 3 grams a week and 30iu a day just to remain competitive.
It is a shame we don't seem to have these young guys coming through at the highest level now. Partly I think because bodybuilding is less popular than it was 20 years ago.