~50% of the top 10 companies in the world by market cap (Facebook, Alphabet, Microsoft, Apple, Amazon) were all started by founders aged 30 or younger. The rest are companies that are over 100 years old (or merged from ones that were) and Warren Buffet's Berkshire Hathaway. I'm by no means saying you can't do it when you're older, but when you're a VC in the business of hitting home runs, it is just hard to ignore that fact.

It's also hard to ignore the fact that the 'sexiest' companies in that list are the aforementioned 5 started by young founders.