Brad Pitt says he is to quit acting at 50

Hollywood star Brad Pitt has revealed that he plans to quit acting when he turns 50.

In an interview with 60 Minutes in Australia, the 47-year-old said he only wanted to continue in the business for another three years.

Asked what he would do afterwards, the actor replied: "Hell if I know."

But he added that he is "enjoying the producing side and getting stories to the plate that might have had a tougher time otherwise".

The actor was promoting his latest film Moneyball, about a struggling baseball team, which has been attracting interest in the run-up to the Oscars.

Pitt has already produced more than a dozen films including Moneyball, The Tree of Life, Kick-Ass, The Time Traveller's Wife and his upcoming zombie film, World War Z.

In another recent interview with The Sunday Times' Culture magazine, the star said he thought he was nearing his "shelf life".

"Although there are a couple of things I'd still like to do. I am looking forward to playing a foul-mouthed grumpy old dude one day, that's for sure," he added.

Pitt also told 60 Minutes' Tara Brown he was considering having more children with partner Angelina Jolie, saying: "I don't know that we're finished."

The couple already have six children together - three biological and three adopted.