The Australian will be the oldest driver in Formula 1 next season following Michael Schumacher's decision to retire and the omission of HRT F1 from the 2013 campaign, which leaves Pedro de la Rosa without a drive for next season.
Webber was outscored by over 100 points by team-mate Sebastian Vettel in the 2012 campaign but the 36-year-old still feels he has the ability to land the Drivers' Championship and has no plans to retire.
"I'm not at the start of the career, I know that. I'm more towards the back end of my career," he said.
"My goal is to put together a campaign. I have fought for championships and I've had some good and very special memories over the past few years.
"Your peak is all relative. You've got to piece it all together.
"And you've got to be honest with yourself and say 'look mate, it's the right time now' - and I don't think it is the right time now."