The fastest finishers in ultramarathons more than 200 km in distance were 40-45 years old and have to be classified as "master runners" by definition. In contrast to reports of marathoners and ultramarathoners competing in races of 161 km in distance, the increase in participation and the improvement in performance by age group were less pronounced in ultramarathoners competing in races of more than 200 km.
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Knechtle et al. (2013) studied this question.
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