Am I the only post-40-year-old who remembers the joy of ticking off old people by wearing a smart-aleck T-shirt? I wondered about this amid the coast-to-coast grumbling over Urban Outfitters, the Philadelphia-based clothing retailer that recently pulled from its stores a T-shirt that said, "Voting is for Old People." Imagine. Young people mocking the habits of their elders. Why, next thing you know the young will be making fun of old folks' clothing styles, driving habits and comb-overs. Horrors. As a kid, I had several T-shirts that caused oldsters to bristle. One of my favorites was emblazoned with marijuana leaves...