Facebook CEO Mark Zuckerberg: world's richest person by age?

If Facebook hits a valuation of $100 billion when it goes public later this year, the company's co-founder and CEO Mark Zuckerberg will be the richest man in the world, when adjusted for age.

Facebook co-founder and CEO Mark Zuckerberg is already very rich. With his company filing for a $5 billion initial public offering (IPO) earlier this month, he's about to get a whole lot richer. In fact, if Facebook goes public at the estimated $100 billion (the company is already valued higher than that on secondary markets), Zuckerberg will be the richest man in the world when adjusted for years of age, as pointed out by The Economist.

As I noted when looking over Facebook's IPO numbers, Zuckerberg has a 28.4 percent stake in his company. Assuming a $100 billion valuation for Facebook, he will be worth $28.4 billion. Given that Zuckerberg is 27-years-old (he'll be 28 on May 14, and Facebook is expected to go public in May), the young man will have made an average of a billion dollars for every year he's been alive. Oh, and that's not counting his $500,000 salary and 45 percent bonus.

As you can see in the chart above, Zuckerberg's net worth is being compared to other billionaires, some of who will still be richer than him when Facebook goes public, but most of whom he is expected to blow right past. Most remarkably, he is the youngest of all of them by a considerable margin. In the top 100, only Google co-founders Larry Page and Sergey Brin are also under 40.

The data is the most accurate we have right now, but it's still worth noting a few discrepancies that places Zuckerberg in ninth place. Only Zuckerberg's net worth is an estimate for 2012: everyone else's numbers are from Forbes' 2011 billionaires list. As such, we'll have more precise numbers sometime next month when Forbes updates its list for 2012.

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