The actor showed up with a full beard at Sunday's (February 24) Academy Awards in Hollywood to see Argo - a film he produced - take the 'Best Picture' prize.
Speaking to E! News at the awards show, Clooney joked that he is slowly coming to grips with ageing.
"I was a little surprised how grey [my beard] was when it came out," Clooney teased, adding: "It came out and it's grey! You're like, 'What the hell happened?'"
He then quipped: "I was young once but now I'm old."
Clooney's beard drew rave reviews from his partner Stacy Keibler, who said that she finds him as attractive as ever.
"I love it," Keibler declared.
Clooney will next appear on the big screen in the sci-fi thriller Gravity, opening on October 4 in the US. A UK release has not yet been announced.
Watch a trailer for Argo below: