Macaulay Culkin cracked up fans with a hilarious post about his birthday on Twitter.
The star, who celebrated his birthday on August 26, wrote: "Hey guys, wanna feel old? I'm 40. You're welcome."
He followed up with a second tweet that said: "It's my gift to the world: I make people feel old. I'm no longer a kid, that's my job."
Some fans were shocked by Culkin's age, with many poking fun at the fact on social media.