Beckham is surprised Giggs is still playing.
He told MUTV: "I'm not jealous that he's 40! That's a few years away for me yet. It's amazing what he's achieved, and what he's done for this club is incredible.
"The fact that he is still playing top-flight football at 40 years old - and still performing the way he's performing - doesn't surprise me, as I know the drive he's got and what this club means to him. It is amazing to see."
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