Somewhat off-topic, but this struck me as an incredibly American comment. The idea that it's getting "too late" to achieve "impressive success" or whatever you call it before you have even finished your university education -- or even high school, that is. None of the richest men (counting the more-or-less self-made men) in my country seem to have achieved any success until they were well into their 20s.
Really that's the way it is in the US as well. There are a few outliers who made a big splash at a young age. Most people aren't really taken seriously until they are at least 40.
I remember when that issue was a current topic. I kept thinking that the "peak founding age" had been pushed low by the generation gap between people born before-and-after ~1980. The fact is that there would be relatively few technology start-ups being founded by older people since the skill set was much more rare for them. But from 1980 on, I'd think that it is much better represented in the population.