Europe has a system that in many ways I can not disagree with. You start with a smaller bike after a period of time you would move up to the medium, then graduate to the big bikes.
I started riding in 1961 at the wise age of 17. Had a 175 Honda. Then moved up to a big 350 Dual sport Honda, ( the big bikes were 450) , Then I got a BMW 750. No one ever would want one bigger. I can't count the number of bikes I have had. I am getting ready to turn 75 and still put 15 to 20 k a year on my bikes. I live in Oklahoma , and it is not uncommon for some one to start small , jump to a big bike , then jump to the emergency room. Surviving on a motorcycle is a learning experience that takes time. Young with good reactions is great , but remember we were all young and DUMB. Better to be a ******* now than a father in morning later.