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 Jeff Bezos, Oracle's Larry Ellison, and the "Google Guys," Larry Page and Sergey Brin.