Main difference is the developmental years that mold who we are as people. Yes, you can pick up a lot in your youth. But your drive is always something that you pick up throughout your teenage years and it carries you throughout adulthood. Trust me, it's wild when that first chunk hits your accounts. I got my signing bonus in at 21. It changes you when you go to sleep one night and have a hundred bucks in your account and wake up that Wednesday morning (some organizations Tuesdays)and all of a sudden youre a millionaire. Won't even say what that second contract is like mentally. But I can imagine going through that at 16,17,18... Where's your motivation then to get up at 4am and grind with your brothers? These mother ****ers just wanna sleep in half the time now. It takes a different kind of human. A different motivating factor has to click now. Personally I'd say that's pretty **** hard to evaluate before you put them in that position.