
It's been a while since I've read it, but off the top of my head: most successful founders are older than you probably think, have less industry experience than you probably think, start (like nVidia) with more competitors than you think, but (to your other point) are more likely to have more entrepreneurial experience than you think (even very young famous founders like Zuckerberg or the Collisons had another venture before the one that made them very well known).
Honestly I found Super Founders kind of dry, but it's one of the only data-driven books about what differences exist between founders of businesses with exception outcomes vs founders with less successful outcomes that I've read.
Most significant property of billion dollar startup founders is that they're more likely to have founded a multi million dollar startup before. That doesn't necessarily mean that they're super talented, but more that they've got the good qualities as well as the required experience. Anyway the book has loads of great insights.
