91-year-old Ong Kim Hwa participated in the 10km Men's Senior Veteran category of the Petaling Jaya Half Marathon on Aug. 17.

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They said they had one aim in mind: "Just finish it." Meanwhile, a contingent from Kidney Care UK included the parents and children of people who have benefitted from the charity's services.

For instance, in 2013 only 6% of athletes failed to finish Ironman Coeur d’Alene. There have been a handful of years with single-digit did-not-finish percentages.