Happy birthday, Warren Buffett! Here's another $2 million

Warren Buffett turned 86 on Tuesday. At an estimated wealth of about $61 billion, he's averaged earning about $1.94 million per day for every day of his life.

Of course we know that's not totally an accurate picture, because he made a lot more in the second half of his life than in the first half. But as a way of comparing age and wealth, that $1.94 million is a number to put in perspective.

Based on that ratio, he'd be ranked seventh on the billionaires list.

Topping it would be Mark Zuckerberg and Bill Gates , the only two people who've averaged over $3 million per day. Many other famous tech giants crack the elite cutoff level of $1.5 million per day. They include Amazon's (AMZN) Jeff Bezos , Oracle's (ORCL) Larry Ellison , and the "Google (GOOGL) Guys," Larry Page and Sergey Brin .

As head of Berkshire Hathaway (BRK-A), Buffett is the oldest CEO in the entire S&P 500 , followed close behind by 85-year-old Rupert Murdoch of News Corp (NWSA). On the exact opposite end, Facebook's (FB) Zuckerberg is the youngest CEO in the 500. He's 32.

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