Do older athletes reach limits in their performance during marathon running? A French research group has studied the performance of the marathon runners at the New York City Marathon ‘from 1980 to 2009. The proportion of older runners increased significantly.Male runners over 64 years old as well as female runners over 44 years could improve their marathon time significantly. It looks so that the older runners can run even faster marathon times over the next few years, see https://pubmed.ncbi.nlm.nih.gov/21617894/