I think the narrative of the young dropout founder is just more palatable and headline worthy. That's why people believe or want to believe that and eat those type of stories. Twenty year olds think that they can build the next FB from their dorm room. Not to say that's impossible and they shouldn't try. I got invaluable experience from doing those things in college, but I'm glad I didn't drop out or continued to work on those projects full time after graduation.