"The moment you start questioning yourself and asking 'how am I going to go out of this sport' - well it's never crossed my mind. It's just not something I'm even in the mood to think about.
"People think I'm going to retire at the 2012 Olympics - which is not true. Even though you never know, it depends on your body, I would like to play beyond that so we'll see how it goes."
The 16-time Grand Slam winner is currently defending his Madrid Open title which, in 2009, came at the start of an extraordinary summer when he also completed the coveted 'double' of Roland Garros and Wimbledon.
On 23 July, shortly after his Wimbledon win over Andy Roddick, wife Mirka gave birth to twin daughters Myla and Charlene.
"It was a very emotional few weeks and months," added Federer.
"Looking back now, one year ago I didn't have two daughters, I didn't have three more Slams and one more Slam final. It's quite amazing what has happened in the last year."
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