Ask Rodger Federer's fans, and they'll tell you that age is just a number. But I can assure you it's much more than that in the world of sport.

While Rodger Federer would like to forget his  2013 season, the Swiss maestro has managed to generate more questions than answers.

Does he still have anything left in the tank to win another grand slam? Can he regain his number one ranking? Or is this the start of the end for one of tennis greatest ever players too grace the game?

At 32, Federer is the oldest player in the ATP top ten ranking. In fact he's the second oldest player in the top 20, with Tommy Haas being the oldest at the age of 35.

While age is just a number, Federer's fitness this season has seen him miss some tournaments with back problems, whilst fatigue-related off days have become more frequent recently.

While people would argue that Andre Agassi played until he was 36, the game has changed significantly since then. Five set matches are longer than ever with players having to be fitter, faster, stronger and mentally sharper than their opponent over the course of the season. All of this takes its toll on a players body.

And at 32, Federer might feel his body is not capable of matching that of the younger guys on court. While his fluid, seemingly effortless game has helped keep him injury free over the years, he and his coaches have a done exceptional work to keep his workload low and hit fitness levels high.

But his opponents have started to get the measure of him the past few years. While Federer has had a mental edge over the likes of Murray, Djokovic, Tsonga and co. in the past, they have started defeating the Swiss regularly.

Federer looks mentally tired, his performances have dipped since the 2010 Australian Open final victory against Andy Murray. Since then he has only won two Grand Slam titles, while in previous years he would have won four or five.

He has also sunk to new lows this season, with a second and fourth round exit at Wimbledon and the U.S Open. This is new territory for Federer. This is a player used to success, being in the semi-final or final.

Mentally he has taken a pounding, and, with injuries, a loss of form and experiments with a larger racket frame, it suggests the Federer himself feels things are no longer quite the same.

After all, he is father now. While other players thoughts might be on tennis 24/7, Federer has duties of putting to bed his twin daughters and spending as much time with them as possible.

Last year when he won Wimbledon Federer said: “People forget sometimes I do have twin girls. That has had a massive impact on my life. It’s helped my game more than anything because I think I’m playing some of the best tennis of my life right now”

Whether he might be thinking the same fourteen months later, Rodger Federer is clearly not the force he once was, when he use to rule the court.

Although he is ranked number five in the world and still has to qualify for the end of year Barclays ATP tournament, you can never write off the Swiss Maestro.

After failing to win a single Grand Slam in 2011, he regained some of his best form to win Wimbledon in 2012 by defeating top ranked Djokovic in the semifinals.

Federer returned to the top spot in the ATP world rankings and in doing so broke Pete Sampras record of 286 weeks top of the world rankings list.

That's the great thing of sportsmen and woman, they make comebacks when you least expect them too. Just ask Rafael Nadal.

It would be sad too see Rodger Federer exit tennis on a low key. After all he has done for tennis as a sport, Federer surely would not want too call it a day after a early exit from a grand slam or Masters series.

You would expect him too retire after winning another grand slam, but with Nadal, Murray and Djokovic playing some of their best tennis of their career, it's hard too see the former world number one lift another grand slam title.

But for Federer, surely, time is not on his side anymore.

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