AGE ISN'T JUST A NUMBER-IT'S A WAY OF KEEPING SCORE. THIS IS YOUR SCORECARD. The day we turn any age, we become contemporaries of everyone who has ever been that age, and it becomes our business to know that Bob Dylan wrote "Blowin' in the Wind" when he was twenty, Orson Welles cowrote, directed, and starred in Citizen Kane when he was twenty-five, Winston Churchill was fired from the Admiralty when he was forty and took up painting, and Jane Austen...