Roger Federer's morning coffee isn't brewed from the fountain of youth, but the 37-year-old Swiss continues to play timeless tennis.
The five-time Indian Wells champion charged into his eighth straight BNP Paribas Open quarterfinals conquering Kyle Edmund in 63 minutes.
More: Federer Flies Into Quarterfinals
Palm Springs is a popular celebrity retirement community, but it's been a revival ground for Federer, 40-year-old Ivo Karlovic, who made history this week as the oldest man to win a Masters match, and 38-year-old Venus Williams.
So what's the key to the 20-time Grand Slam champion's longevity?
The father of two sets of twins cites two essential elements to longevity: enjoying the travel of life on the global circuit and playing with passion.
"No. 1, you've got to be happy to be on tour," Federer said. "It's very simple, because usually you're not at your career high, you know, ranking-wise, anymore at that age. So you have to pick on something else that's exciting for you, whatever that may be: travels, match play, whatever, practice, life on the road.
"So you've got to be passionate about what you do. It's nice to see. I feel more guys and more girls are, like, really actually enjoying that part of the tour, which before I felt players were happy to do something else, which is cool, too, you know. I think tennis really provides you with an incredible platform where you learn a lot, you run into a lot of interesting people."
Life as a tennis pro empowers players to take charge as the boss of their brand as well, Federer said.
"At the end of the day, you're the boss of your own company, if you like, and you can choose how much you want to train, where you want to play," Federer said. "It will be very different at the time when you retire, most likely, because it will never be quite... you won't be quite in control unless you run a company, and even then you have a completely different pressure than you have as a tennis player.
"So I think players see more and more what actually a privilege it is to be a tennis player, and that's nice to see."
Photo credit: Mark Peterson/Corleve