Hollywood hardman Kiefer Sutherland fears he's getting too old for his hit show 24 - he's been struggling with the stunts since he turned 40. The tough guy actor hit the milestone age last year (Dec06) and admits playing the show's main character Jack Bauer is taking its toll now. He says, "I am noticing as I'm getting older that some of the physical stuff is not as easy. "I used to be able to do screaming, like, 12 hours a day no problem and my voice would be fine. These days it gives out a little quicker."