LONDON - "When I get older, losing my hair, many years from now," sang Paul McCartney on "When I'm Sixty-Four," a jaunty tune from The Beatles' "Sgt. Pepper" album. A spokesman would not say how McCartney planned to spend the day, but he could be excused for skipping a party. It has been a traumatic year, in which the former Beatle split from his wife of four years, Heather Mills McCartney, amid lurid headlines about their relationship and her past. "People seem to be interested in him as a celebrity, but not as a musician," said Beatles historian Peter Doggett...