YouTube has long been known as a place popular among younger viewers, but what happens when those people get older? For Brian Albert , the executive who represents the Google video-sharing service in its negotiations with Madison Avenue, the answer is simple: They keep watching YouTube. “The older millennials will turn 45 this year, and they really are the first generation to grow up with a supercomputer in their pocket. To them, there really is no difference between streaming a video on their