Marathon Pace Control in Masters Athletes An Irish group has examined the pacing of age class runners at the New York City Marathon 2015. They have made performance groups based on the marathon world record. It showed that the running speed during the marathon by age, gender and performance levels are influenced.
Under string, the fast age group runners are better in pacing than the slow runner, and that regardless of age and gender. The work can be found under https://pubmed.ncbi.nlm.nih.gov/28714744/