Facebook. Twitter. Groupon. Zynga. LinkedIn. Yelp. The list keeps growing, but the ages don't. Mark Zuckerberg (impending Facebook IPO: shooting for a $100 billion valuation), no longer a new name to anyone, is still only 27. Andrew Mason, CEO of Groupon (which raised $700 million for its IPO), is 27 as well. Zynga, which went public in December, is helmed by Mark Pincus, who even at 45 is on the young side for what was, until recently, the prototypical American blue-chip company CEO. (Think Warren Buffett of Berkshire Hathaway, 82, ex-Ford CEO Alan Mulally, 66, or ExxonMobil CEO Rex Tillerson, 60.) Let's face it: the biggest, buzziest business news is continually coming from companies that are helmed by people who listened to Green Day in middle school.
