Running News Daily

Kenyan distance-running veteran Mark Kosgei Kiptoo has added another extraordinary achievement to his remarkable career, setting a new M50 world record in the half marathon at the 2026 San Sebastián Rural Kutxa Half Marathon in Spain.

At 50, Kiptoo produced a stunning 1:03:57 over the 21.097-kilometre distance, winning the race outright while rewriting the masters record books.

His performance demolished the previous M50 world record of 1:06:23, set by South Africa’s Titus Mamabolo, by 2 minutes and 26 seconds. The scale of the improvement makes Kiptoo’s performance one of the most remarkable masters distance-running achievements of the year.

The Kenyan arrived in San Sebastián in impressive form after already showing that age had done little to diminish his speed. At 49, Kiptoo won the Azkoitia-Azpeitia Half Marathon in March in 1:03:17, a performance that underlined his extraordinary endurance and ability to maintain world-class pace well into his late 40s.

Kiptoo’s latest achievement is another milestone in a career that has already delivered success across track, cross country and road running. Now competing in the masters ranks, the Kenyan continues to demonstrate the exceptional endurance and speed that made him one of the most respected distance runners of his generation.

Born on June 21, 1976, Kiptoo has spent decades competing at the highest level of international athletics. His career includes major performances on the track and road, and his transition into the masters category has done little to slow his remarkable competitive drive.

Kiptoo’s transition to marathon running produced another extraordinary achievement. At the 2018 Frankfurt Marathon, he clocked 2:07:50 to establish what was then a world record for the Masters 40-and-over age group, further highlighting his ability to remain competitive well beyond the traditional peak years of an elite distance runner.

That performance offered an early indication of the extraordinary longevity that would later define his masters career. With the M50 half-marathon world record standing at 1:06:23, Kiptoo arrived in San Sebastián with history within reach—and he did far more than simply break the mark.

He obliterated it.

Kiptoo’s 1:03:57 was also fast enough to secure the overall victory, putting the 50-year-old Kenyan ahead of considerably younger competitors. Spain’s Iraitz Arrospide was the leading Spanish finisher, taking second in 1:04:48, while Youness Assehli completed the podium in 1:07:16.

Kiptoo’s record run was also notable for the consistency of his pace throughout the race. He passed 5 kilometres in 15:22 before reaching 10 kilometres in 30:21, with his second 5-kilometre segment covered in a remarkable 14:59. He continued to maintain the demanding tempo, reaching 20 kilometres in 1:00:40 before completing the final 1.097 kilometres to stop the clock at 1:03:57.

Those splits underline just how controlled and aggressive Kiptoo’s performance was. Rather than relying on a late surge, the Kenyan built his record through sustained world-class pace from the opening kilometres to the finish, averaging roughly 3:02 per kilometre across the entire half marathon. The performance not only shattered the longstanding M50 record but also demonstrated that Kiptoo’s extraordinary speed remains intact at an age when most elite athletes have long since stepped away from the highest level of competition.

In San Sebastián, Kiptoo’s experience came together in one extraordinary performance. He not only won the race outright but also lowered the M50 world record from 1:06:23 to 1:03:57, an improvement of 2 minutes and 26 seconds. At 50, he continues to show that world-class determination and years of experience can still translate into astonishing performances over 21.1 kilometres.

Kiptoo’s credentials were established long before his entry into the masters ranks. A former African champion over 5,000 metres and a winner on the Diamond League circuit, he competed successfully against the world’s best during the peak of his track career.

His track personal bests include 12:53.46 for 5,000 metres and 26:54.64 for 10,000 metres, evidence of the elite speed and endurance that have remained the foundation of his longevity in the sport.

The latest record is therefore more than another entry on a masters list. It is a reflection of a career built on consistency, discipline and an extraordinary ability to remain competitive across different generations of distance runners.

At 50 years old, Mark Kiptoo is still running at a level that commands attention.

A 1:03:57 half marathon, an outright race victory and a world record—another remarkable chapter in the career of one of Kenya’s enduring distance-running stars.