To the extent their claim is true - eg, the average age of all business founders, including barber shops and so on, is greater than 20 - I doubt anyone ever bel

To the extent their claim is true - eg, the average age of all business founders, including barber shops and so on, is greater than 20 - I doubt anyone ever believed otherwise. And to the extent they're trying to refute a real, commonly-held belief, eg. something like "the average founder of venture-backed social media companies, weighted by valuation, is in their 20s", their data can't refute it because it's not fine-grained enough. The most detailed category they use is "Data Processing, Hosting, and Related Services", which covers quite a lot of ground.