Bill Gates, Mark Zuckerberg, and Jeff Bezos: Here's how old the founders of 23 tech giants were when they started their first companies

· 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...