"Calculating your business' worth can be done in three ways. The first looks at your company's assets; the second examines the prices of similar businesses; and the third looks at cash flow."
"Founders holding MBA degrees established their companies the soonest compared to other advanced-degree holders—an average of 13 years after graduation. Master's-degree holders took 14.7 years and bachelor's degree holders took 16.7 years. Those with PhDs typically waited 21 years."
Update 04-may: here is another article related from WSJ.
Ricardo Seguel P.