London, Dec 1 - Charlize Theron doesn't know how long she will remain an actress but says it is the uncertainty of her profession that makes it interesting.

"I don't know if I feel I'm here to stay, but that's a good thing. That keeps you on your toes. I think this is an industry where you can't get too comfortable.

"It's constantly churning with great talent, and you've got to raise the bar and try to push yourself. I don't ever want to kind of feel, 'Yeah, I'm here. I made it.' I think that would probably be the time to retire," contactmusic. com quoted the 36-year-old as saying. (IANS)