George Clooney's children are "slowly figuring out" his job.

The 64-year-old actor finds it "hard" to watch his old movies because he doesn't like seeing how much he has changed with age, but he made an exception for 2009's animated comedy Fantastic Mr. Fox - in which he voices the titular lead character - because it has been "kind of fun" to see it through the eyes of his and wife Amal's eight-year-old twins Ella and Alexander.

He told People magazine: "It's a weird thing. As you get older, it's hard to watch movies when you were younger because you're like, holy s***, that doesn't even look like me anymore.

"You know, I'm watching because I've got 8 year olds, I'm watching Fantastic Mr. Fox, which is a little easier because it's not really me, it's just my boys. And that's kind of fun because the kids are slowly figuring out what I do for a living."

In 1997, George played Batman in the widely-panned Batman and Robin and he previously admitted he had had a hard time convincing his son that he was the Caped Crusader.

He told W magazine earlier this year: "Halloween's a big holiday. My son went as Batman. He hadn't seen Batman yet.

"I always say to him, 'You know I was Batman.' He's always like, 'No.'

"I don't know that he knew how profound it was when he said I wasn't Batman. A couple of weeks ago, I finally showed it to him.

"It wasn't great for grown-ups, but it's great for eight year olds, so he loved it."

George previously gave a blunt assessment of his performance in Batman and Robin, admitting he was "bad" in the movie.

However, the Jay Kelly star learned a valuable lesson about choosing his projects from the film.

He explained to Empire magazine: "I was bad in it. It's a bad film. But I was also being held responsible for it, in a weird way.

"Then I realised; if you're gonna be Batman in Batman and Robin, you're gonna be held responsible. Which never occurred to me.

"To me, I was still an actor getting a part.

"From that moment on, I was like, 'I have to pick the script, not the part.' So the next script I did was Out of Sight and the next I did was Three Kings. After that, O Brother, Where Art Thou?. The scripts changed considerably.

"Everybody would say that Batman was not the best. But the good news for me was I was able to take that as a lesson, as opposed to a career-ended."

And George admitted he didn't even enjoy the experience of making the blockbuster because everyone on set was having such a "tough time".

He added: "I did not enjoy that experience. I love Joel Schumacher, love the actors. But everybody was having a tough time. There was a lot of tension.

"It took, like, eight months to shoot."