Differences in age of peak marathon performance between mountain and city marathon running - The ‘Jungfrau Marathon’ in Switzerland The age of the best marathon performance has so far been studied exclusively for city marathons on a flat course. We now examined the age of the best marathon performance at a mountain marathon (Jungfrau Marathon) and compared with flat marathons in the same land.The best way to determine the absolutely best age for the fastest time is a non-linear regression. If you take the fastest runtime in a 1-year interval over the whole age range, the age of the best marathon time in men and women in the mountain marathon is higher than in the flat marathon.
If one takes all the finishers in a 1-year interval, the age of the best marathon period in men and women in the mountain marathon is deeper than in the flat marathon. All precise numbers can be found at https://www.ncbi.nlm.nih.gov/pubmed/28052642