NEW: 80-year-old Natalie Grabow of Mountain Lakes, New Jersey, becomes the oldest woman to finish the Ironman World Championship. The American was the first female in the 80-84 category to complete the race. The race took place in Kailua-Kona, Hawaii. Grabow finished in 16 hours, 45 minutes, and 26 seconds. The race included a 2.4-mile swim, a 112-mile bike race, and a 26.2-mile run, for a total of 140.6 miles. Impressive and inspiring.