Speaking at the UK press conference for his latest film War Horse, he explained that his good friend and fellow director Clint Eastwood inspires him to keep working.
"I have no plans to quit. Clint Eastwood is one of my best friends, and we have an almost jokey relationship about retirement," he said.
Additional reporting by Chris Allen.
"Clint's 81 now, and I always say 'Clint, are you ready to retire?', he says 'No, are you?', I say 'No'. I've been waiting for the phone call that says Clint is hanging up his spurs. If it doesn't happen for Clint, it's not going to happen for me."
He added that his daughter was a large reason behind why he wanted to direct a film version of War Horse.
"I was about to go to London to see the play for the first time. It made me cry and I loved it so much," he explained.
"My daughter said, 'You have to make War Horse, you have to make it for me'. So I did."
Spielberg also revealed that 1975's Jaws was a turning point in his career.
> Steven Spielberg: 'War Horse is my first truly British film'
Watch the trailer for War Horse below: