Zuckerberg named America’s Richest Entrepreneur under 40 Facebook’s 32-year-old Co-founder and CEO Mark Zuckerberg, with a net worth of $50 billion, has topped Forbes’ list of America’s Richest Entrepreneurs Under 40 years of age for this year. Zuckerberg is followed by another Facebook Co-founder Dustin Moskovitz and Uber Co-founder Garrett Camp. Snapchat Co-founder