Earlier quoted context omitted.
>But when you are studying it is the best time to start a company. What? Most people would argue that having knowledge of the field, experience and contacts; the sort of thing you get after working in a field for a while, is going to help more than the slightly increased physical stamina you have as a very young person.
Later you have a family and responsibility for your children. In college you are free and can take risks.
Starting a business before 20-21 is not really ideal. Yes, some people can do it. But those people have an over the top mental and emotional maturity that nominal case is lacking, and college is a great way to get there.
Are you really suggesting that you see a CEO in a nominal high school graduate? Most of them don't have a slightest clue how to deal with people, let alone negotiate their terms -- knowledge in domain being aside.