Swiss legend insists retiring in a blaze of glory is not his top priority

Roger Federer arrived for his interview at the precise appointed time, steering his white sedan into a parking spot in an industrial area dotted by art galleries about 15 minutes from his luxury apartment in Dubai.

After obliging a selfie request from someone on the street, Federer makes his way up to a secondstory loft area and sits. He crosses his legs, kneads his right calf and winces.

"Just started training. I'm surprised I could walk the stairs as good as I have," Federer said with a laugh. "My calves are, like, killing me. Just getting back into it. The shock on the body is, I don't want to say 'immense', every time, but I've been on vacation for two weeks. The shock just hits you hard."

Ah, the ravages of age.

Federer, who won the first of his record 20 Grand Slam titles when he was 21 and now is 38, explains that he must "go back to the drawing board" after "just missing out on The Big One," a reference to his fifth-set tiebreaker loss to Novak Djokovic in the Wimbledon final in July.

So all of just two days into Federer's preparation for next season－he flies to Melbourne on Jan 9, a week before the Australian Open draw－he is taking a 48-hour break, sitting out his twice-daily fitness sessions.

No one this old has won a Grand Slam title in the professional era.

As a younger man, Federer said, he didn't allow himself such a respite, working six or eight days in a row to get going. But now? The "waves", he calls them, making an undulating motion with his famous right arm－time on, then time off－offer his body a chance to recover.

They also let him "go through the wall" on the day before a rest period, because "otherwise, you maybe would hold back just ever so slightly, because you just don't know how you're going to feel the next day".

Federer recognizes that continuing to play tennis at a high level long past the age when many greats of the past were done (his idol, Pete Sampras, competed for the final time at 31) means he repeatedly faces questions－from fans, from the media, from those around him－about how long he will continue on tour.

And while he can't provide a definitive answer－because, quite simply, he says he doesn't have one－Federer is willing to discuss this aspect of the subject: He does not consider it important to walk away at the top of his game and the top of his sport.

When he's told about a newspaper opinion piece from 2013 that posited he should quit then to avoid ruining his legacy, Federer just smiles and waves his hand.

He knows, of course, that he's managed to reach another seven Grand Slam finals since the start of 2014, winning three.

But he also believes the notion that an older athlete could harm his or her status by hanging around too long is nonsense, no matter what the decline looks like.

"I don't think the exit needs to be that perfect, that you have to win something huge... and you go, 'OK. I did it all.' It can be completed a different way, as long as you enjoy it and that's what matters to you," Federer said.

"People, I don't think, anyway, remember what were the last matches of a John McEnroe, what were the last matches of a Stefan Edberg. Nobody knows. They remember that they won Wimbledon, that they won this and that, they were world No 1. I don't think the end, per se, is that important."