> He's way too young for this attitude

I've always found these kind of comments unusual. How old is old enough? For me this usually came off as arrogant.

> the feeling of being superior is a common problem for all types of skills if you're young

I know plenty of people who still have that exhibit that sort of behavior in pretty much every age bracket. Arrogance doesn't correlate to age. It's kind of arrogant to say "You cant think that way, you're too young" too.