The article is short and worth a read, but to save you a click: 45. However, the data is really not presented well and it's hard to cut through the clickbait a

The article is short and worth a read, but to save you a click: 45. However, the data is really not presented well and it's hard to cut through the clickbait aspect of this because the author conflates a few terms and it at least seems like this is about "entrepreneurs" rather than the HN-type definition of "startup". If you look at the Kellogg writeup link, the authors apparently looked at "technology" businesses and limited the set to the 0.1% "fastest-growing" (not sure how they determined that). The more interesting metric to me is in the Kellogg writeup as well: average age of tech IPO company founder is 47. The takeaway for me is a bit different than the headline - Middle-aged founders are more likely to start sustainable, long-view companies than their younger counterparts. However I'd love to slice the data myself to see speed-to-exit vs. age plotted. I think that might tell a different story and better match VC models.