For all the jokes I throw at golden balls or, The Spice Boy as some like to call him, his competitiveness and his accuracy have not diminished even at his age. His legs and his back may give him the final blows of his career, but he's still got something let in him.
I liken him to Cuauhtemoc Blanco in that regard--although Beckham has Cuau beaten in physical fitness. The same vision and ability is there (it won't go away), but it is a matter of time before the other parts of his body and the hits he takes take their toll and force him to retire. I still think he has a season or two (possibly 3 if he stays in good condition).