AUTHOR=Morganti Gabriele , Kelly Adam L. , Lascu Alexandra , Brustio Paolo R. , Padua Elvira , Filetti Cristoforo , Porta Marco , Briotti Gianluca , Ruscello Bruno TITLE=Relative age effects in European soccer: their association with contextual factors, impact on youth national teams' performance, and presence at the senior level JOURNAL=Frontiers in Sports and Active Living VOLUME=7 YEAR=2025 URL=https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2025.1546978 DOI=10.3389/fspor.2025.1546978 ISSN=2624-9367