NEW YORK (AdAge.com) -- The average U.S. head of household is now just shy of 50 years old, and that's a startling statistic with serious implications for big brands, says Peter Francese in a special Ad Age report. He's the founder of American Demographics magazine and a demographic trends analyst at Ogilvy & Mather
. In other news in this 3 Minute Ad Age, a new Victoria's Secret marketing campaign targets college campuses. And Activision's "Guitar Hero" franchise is changing the way music is marketed.