George Clooney believes he is too old to be a ladies man.The 'Ocean's Thirteen' actor is a two-time winner of People magazine's prestigious Sexiest Man Alive title and has been linked to a string of beautiful women, but now says he feels past it. When asked if he can have any woman he wants, Clooney told Newsweek magazine: "Um, ah, no, because I wake up and my knees hurt and I think, 'I'm 45.'"Despite winning an Oscar for his role in 'Syriana' last year, Clooney has admitted he is starting to prefer being behind the camera as he gets older. He said: "Directing is the key to film making. Everything else is just paint."I don't yell at people through a megaphone though. I'm very modern. I have someone that I yell at and they yell it out loud."Clooney has also admitted he has been stressed out this year by the constant questions about the marriages of his A-list friends, Tom Cruise and Katie Holmes, and Brad Pitt and Angelina Jolie. He said: "This year it was all about Tom and Katie getting married at my house. Tom sent me a bottle of wine to thank me. With Brad and Angie, I say they're not getting married and the press goes, 'Arrgh!' The more you deny,the guiltier you sound."