Thirty-one is just about the right time to have a billion-dollar idea.
If you're going to have one at all.
Of the 52 founders of 35 billion-dollar companies, the median age is about 30, according to the San Francisco Business Times.
That's about the age when the founders of billion-dollar, venture-backed companies of today were in start up mode, according to a review conducted by Harvard Business School.
However, the school took a step back about making any kind of age-based pronouncement.
"We can conclude that founders under the age of 35 represent a significant portion of founders in the billion-dollar club, and most likely the majority," a report author said.
However, another report skewed older: current CEOs and presidents at billion-dollar companies are about 42 years old.
