Piers Morgan took to Twitter to express his shock at Macaulay Culkin's age after the Home Alone revealed all in a post that quickly went viral.
Macaulay is the actor who Christmas just wouldn't be Christmas without, thanks to his starring role as not to be messed with youngster Kevin McCallister in festive classic Home Alone and its hit follow up Lost In New York.
He also went onto star in Richie Rich and animated film The Pagemaster, before having a much publicised battle with drugs after divorcing his parents.
And, while it seems like he's been around forever, with Home Alone released back in 1991, many people, including Good Morning Britain presenter Piers were left aghast when he took to social media to reveal how old he is now.
Taking to Twitter on Thursday he wrote: "Hey guys, wanna feel old?I'm 40.You're welcome."
Quoting his post, Piers reacted: "WOW. Happy Birthday Macaulay.. but WOW." And many others shared in his surprise at the revelation.
One follower replied: "No you're not @IncredibleCulk You cant be anymore than 20 you silly sausage ! I refuse to believe this. Aaaaaaaaarrrrrgggghhh !!" and another responded: "OMG, I must be ancient"
Another fan suggested that Piers get child star Macaulay on his ITV show, tweeting: "A good life stories guest maybe Piers?"
