There were actually two different reports: one about general entrepreneurial activity index (3D graph) [1] and another one more specific about tech companies (3

There were actually two different reports: one about general entrepreneurial activity index (3D graph) [1] and another one more specific about tech companies (39 years median age of founder, $1MM revenue) [2]. While your critique is probably on spot for [1], I'm not so sure about [2]. Authors defined "technology" company as working in: semiconductors, computers, communications, biosciences, defense/aerospace, environmental, software, innovation/manufacturing related services (check Appendix for more detailed classification). Age of founder was counted at the time of the incorporation of the company. Of course, there is a survivorship bias, but doesn't this just mean that companies founded by older founders had higher chances to grow to $1MM in sales/20 employees/branches with 50 employees? [1] http://www.kauffman.org/uploadedFiles/kiea_042709.pdf http://www.kauffman.org/uploadedFiles/kiea_042709.pdf [2] http://www.kauffman.org/uploadedfiles/Education_Tech_Ent_061108.pdf http://www.kauffman.org/uploadedfiles/Education_Tech_Ent_061...