The defender is preparing for England's Euro2012 qualifier against Switzerland at Wembley on Saturday and admits that he feels great despite having a 'bad' ankle.
"I don't feel 30. We train with a lot of young players and they make you feel young. I feel good. I feel healthy and fit, so I hope to keep going for a few more years, though it's hard to say how long," he said.
"I do have a bad ankle and it's not something which just goes away so I have to manage it and take it season by season.
"But if I look now and say how I feel, I know I've definitely got three years."