"At the age of 26, you always have to think that there's more to come," Neville told BBC 5 Live. "You can't get to the age of 26 and think, 'My best years have gone.' He has to now challenge himself.
"Giggs has gone from a flying, out-and-out left-winger to someone who now plays off the front, inside-left, he plays central midfield.
"Scholes was a goal-scoring midfielder, off-the-front No 10 player when he started playing as a 16-year-old. Now he's a holding midfielder who controls the game.
"Rooney is still a centre forward, but he’ll adapt over this next 10 years to continue to become someone who’s thought of in the same way as those two players."