It's unnecessary to list Microsoft, Facebook or Apple because they're the hyper rare, very well-known stories the media pushes as clickbait. They're the reason we're buried in mythology stories about young tech company founders.
Larry Page and Sergey Brin fall in-between, although on the younger side, at 25. They're neither in the category with Gates & Zuckerberg, nor of course in the heavily populated 28-30x group.
Here's a counter list of prominent names:
Bill Gates (20, Microsoft), Paul Allen (22, Microsoft), Mark Zuckerberg (20, Facebook), Dustin Moskovitz (20, Facebook), Steve Jobs (21, Apple), Patrick Collison (22, Stripe), John Collison (20, Stripe), Michael Dell (19, Dell), Marc Ewing (23/24 Red Hat), Ted Waitt (22, Gateway), Evan Spiegel (21, Snapchat), Bobby Murphy (23, Snapchat), Marc Andreessen (23, Netscape), Aaron Levie (20, Box), David Karp (21, Tumblr), Palmer Luckey (20, Oculus), John Carmack (21, id Software), Helen Greiner (23, iRobot), Sky Dayton (23, Earthlink), Sean Parker (20, Napster), Shawn Fanning (19, Napster)
Some in the mid 20s mixed group (which includes the Google founders): Drew Houston (24, Dropbox), Tobias Lütke (24, Shopify), Doug Burgum (25, Great Plains Software), Tony Hsieh (26, Zappos), Sachin Bansal (26, Flipkart), Steve Wozniak (25, Apple), Jerry Yang (26/27, Yahoo!)
I don't feel like the study shows something spectacular. Middle-age is the peak of performance, mental and physical health. Everything one created for himself is best seen at this peak and usually people start thinking what to do for the rest of their lives. Middle-age is not usually a time when you start having wild dreams.
Well yeah, that's what it is supposed to do but it is hardly a study - you don't list any counter examples. Where is Apple, Facebook, Google, Microsoft? Those are simply the largest companies I can think of in tech and they all happen to be counter examples.