Age at FIRST million: - 22, Mark Zuckerberg - 26, Bill Gates - 27, Elon Musk - 32, Mark Cuban - 32, Oprah - 33, Jeff Bezos - 57, The Average

Age at FIRST million: - 22, Mark Zuckerberg - 26, Bill Gates - 27, Elon Musk - 32, Mark Cuban - 32, Oprah - 33, Jeff Bezos - 57, The Average