Think that the days of uber-young, rumpled-clothed, college dropout, start up CEOs are gone? Think again. The quintessential start up culture is still alive and well, and, as always, we celebrate its perseverance. CNN Tech spent a day recently with Seth Priebatsch, founder of SCVNGR, a Cambridge, Mass- based start up making mobile apps that combine geo-location with social gaming. This is Seth’s 3rd start up – his first was when he was just 12!