Neville says he was amazed that Giggs, who was 40 on Friday, could turn in such a dazzling display in United's 5-0 hammering of Bayer Leverkusen in the Champions League.
He said: "What Ryan is doing now is incredible.
"If you didn't know he was Ryan Giggs, you didn't know his age and you just watched the game against Leverkusen, you could argue he was 25. It was staggering to watch."
And he added: "You think of those types of things in the 1950s and 1960s when you hear of players like Stanley Matthews playing into their 40s and 50s but you would never think it would happen now.
"You think a defender or goalkeeper could play on but a winger, who has played from 17 to 40 and has adapted his game and is still looking like he can beat a player, it is brilliant."
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