Do non-elite older runners slow down more than younger runners in a 100 km ultra-marathon? We asked ourselves the question of whether there is a difference in the running point between younger and older 100 km runners. We assumed that the older runners were increasingly slower over the 100 km.For this we took the maturities of the 10 fastest men from 2000 to 2009 on 100 km run in Biel and looked if there is a difference over the 100 km in the age groups. It showed that the running speed in runners in the age group was 18-24 years deeper than the running speed of the runners of the other age groups.And it showed that the running speed was not decreased over all age groups with increasing age. This work can be found under https://bmcsportscimedrehabil.biomedCentral.com/Articles/10.1186/2052-1847-7-1