In a temporary obsession over the mysteries of interstate taxation (a subject of forthcoming posts—skip alert!), I missed an important event until my twelve-year-old reminded me today: on September 23, Bruce Springsteen turned 65. Happy birthday, and God bless! And do let’s celebrate. Mick Jagger famously intoned that he’d rather be dead than sing “Satisfaction” at 45; how’s that working out for you, Mr. Geezer? Mr. Ezekiel Emanuel, who’s not much into revving up young people but would rather have government force them to subsidize others, wants to be dead at 75; let’s see how that plays out. Say about the…