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Mark Zuckerberg, who became a self-made billionaire at age 23.
Mark Zuckerberg reached billionaire status at the ripe age of 23, becoming the youngest self-made billionaire in history - today, the 31-year-old Facebook cofounder and CEO's estimated wealth is $45 billion.
He's not the only self-made billionaire under age 35.
A recent report from Hurun, a Shanghai firm that releases yearly rankings and research about the world's richest people, rounded up the youngest self-made billionaires in the world and their estimated wealth.
Here's who made the list:
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