Giggs celebrated his 40th birthday on Friday.
"He always says he will play as long as he is contributing, and there is no evidence of his contribution waning at the moment," Scholes said.
"I am sure he can play until he is 41, 42, maybe even 43. As long as he wants to, he will be able to play.
"The way he plays, he sits in midfield, he controls a game, he can make a pass, he can defend, he can still run up and down all day if he wants to. I really think he is capable of doing that."
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