Mark Webber admits that it will be a difficult moment when he has to take the decision as to whether to retire from F1.

The Australian is set to be the oldest driver on the grid next season after the departure of both Michael Schumacher and Pedro de la Rosa from the sport, with Webber having inked a new twelve-month deal to stay with Red Bull mid-way through 2012.

As yet, there has been no suggestion from Webber that is considering bringing an end to his career, and the 36-year-old admitted it would be a difficult decision to take when the time comes.

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"I haven't been there yet but it is going to be a very difficult moment, no question about it," he told GP International magazine.

"I suppose it's just about getting the timing right - not pulling the plug too early, knowing you have more to give of yourself, or going too long and not being quick enough or struggling to do the things you used to be able to do. That can become an issue as well."

Webber will hope to improve on sixth in the championship standings when the new season gets underway in Melbourne, although Red Bull advisor Helmut Marko has hinted that he will be number two to Sebastian Vettel in 2013.