Question

A student found a strong correlation between the age of people who run marathons and their marathon time. Can the student say that young people will run marathons faster than older people? Explain.​

Answer 1

Elite marathon race times improved from 5 to ~20 years, remained linear between ~20 and ~35 years, and started to increase at the age of ~35 years in a curvilinear manner with increasing age in both women and men. The sex difference in elite marathon race time increased non-linearly and was lowest at the age of ~49 years.