There are many moments in life when you realize that you and your generation are officially moving beyond the fringe of popular culture, or at least to a place where big advertisers no longer feel the intense need to reach you. If you live with a teenager, there's a blazing neon line between advertisers' interest in them (intense) and you (not so much). Teens are relentlessly courted to buy the latest fashions, music and other trendy stuff, while the aging parents are just as relentlessly ignored, except for news about the latest arthritis treatments. That you will bankroll the teens'...