Ironman Triathlon: Number/Mix of Triathletes by Age Group

Nearly half of the 41,000 Ironman-brand triathlon finishers in the 2009 to 2010 season (ending with Kona in October), were aged 25 to 44. Also see Ironman Triathlon Finishers by Event,  Ironman DNF Rates, Top 25 Toughest Ironman Races, and our Ironman Kona coverage.