UNDATED (CNN)-- Fauja Singh, the world's oldest long-distance marathon runner, ran his last race Sunday, in Hong Kong just ahead of his 102nd birthday, he says.

Meet Fauja Singh; not your average great-great grandfather. Singh has just hung up his running shoes after training hard as a competitive long distance runner.

He took up the sport just over a decade ago and since then he's completed nine successful marathons. He says the secret is not his diet, or even his training routine, but simply his love for the sport. He says, "It's because of the happiness I get out of it. If something makes you happy, you'll do it well."

Singh's fans have nicknamed him the "Turbaned Tornado" and a biography about him carries the same name.

His achievements have inspired people around the world. But for him, it was a personal tragedy, the untimely death of his son, that led him to take up the sport. He says, "Because after I suffered a tragic incident in my life, a traumatic experience, I took up running as a new focus in life. And then marathon running developed from there."

And he's broken some impressive records along the way. In 2011, he became the oldest person on record to complete a marathon at age 100, according to officials of the Toronto Waterfront Marathon.

His coach, Harmender Singh, has been working with him for the past 13 years. He says, "He's been an absolute pleasure. He's by best student, I would say, which is ironic because he's twice my age."

While he'll continue to run for pleasure, Fauja has decided it's time to retire from competitive running.

To much fanfare, he's come to Hong Kong to run his final race, a 10 kilometer event. There is a moment of concern when Fauja slips, but he recovers well and continues running.

CNN Espanol's Diego Laje is also running the race and captures a few seconds alongside Fauja in the final stretch of the race. Laje says, "I'm running alongside Mr. Fauja Singh - the world's oldest marathon runner. He may be the oldest, but he's certainly not the weakest."

Fauja Singh crosses the finish line in just over one hour and 32 minutes. Despite the fall, he completes it around 4 minutes faster than when he ran the race last year.

His supporters are thrilled. And when asked how he did it, Fauja reminds us of that secret weapon he uses. He says, "Five or six kilometers into the race, I really decided to go for it. I had lots of power today because I was very happy. The strength I had comes from happiness within."

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