Pop star Hilary Duff is baffled by English soccer star David Beckham's sex appeal - declaring he is "too old" for her. The 19-year-old, who recently split from 28-year-old Good Charlotte rocker Joel Madden, was left so hurt by the break-up that she has ruled out dating older guys in the future - even if Beckham, 31, became available. She says, "He's attractive but I'm over all that now. He's far too old for me."