Mark Zuckerberg, Evan Spiegel, and the two Google cofounders were all already millionaires before they turned 30. Although those tech founders saw massive success from their first companies, other major tech players didn't find wealth and fame until their second or third attempts at launching ventures. These are the ages of 23 tech founders when they started their first companies. Visit Business Insider's homepage for more stories. For tech founders like Elon Musk and Jack Dorsey, it took a couple attempts to start the company that would turn them into industry visionaries and make them worth billions of dollars.