Performance and age of African and non-African runners in World Marathon Majors races 2000–2014

Male and female Ethiopian and Kenyan runners are the fastest and the youngest in both half and full marathon

(2016) Beat Knechtle et al.   SpringerPlus

Kenyan and Ethiopian Distance Runners: What Makes Them so Good?

(2016) Randall L. Wilber et al.   International Journal of Sports Physiology and Performance

The relationship between age and running time in elite marathoners is U-shaped

(2014) Beatriz Lara et al.   AGE

Marathon run: cardiovascular adaptation and cardiovascular risk

(2014) H.-G. Predel   EUROPEAN HEART JOURNAL

Marathon progress: demography, morphology and environment

(2013) Andy Marc et al.   JOURNAL OF SPORTS SCIENCES

Similarities and differences in anthropometry and training between recreational male 100-km ultra-marathoners and marathoners

(2012) Christoph Alexander Rüst et al.   JOURNAL OF SPORTS SCIENCES

Is It Time to Consider a New Performance Classification for High-Level Male Marathon Runners?

(2011) Antonio La Torre et al.   JOURNAL OF STRENGTH AND CONDITIONING RESEARCH

Advances in Analysis of Longitudinal Data

(2010) Robert D. Gibbons et al.   Annual Review of Clinical Psychology

Is There a Sex Difference in the Age of Elite Marathon Runners?

(2010) SANDRA K. HUNTER et al.   MEDICINE AND SCIENCE IN SPORTS AND EXERCISE