What does this research mean for the field?

The relative age effect in major European men's football leagues increased during the early 2000s and subsequently stabilized, rather than showing continuous linear amplification over the 25-season period. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine the temporal progression and stability of the relative age effect across five major European men's football leagues over a 25-season window.

September 5, 2026Science and Medicine in Football

Temporal trends in the relative age effect in five major European men’s football leagues, 2000–2025

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Authors

JTJeremy Torrent LRLoric Rossier

Discussion

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Overview

Longitudinal study uncovers relative age effect stabilization in elite European footballers, suggesting persistent developmental selection bias across professional leagues.

Key Points

To determine the temporal progression and stability of the relative age effect across five major European men's football leagues over a 25-season window.
Longitudinal analysis evaluating birthdate distributions across 25 seasons (2000–2025) in five major European men's professional football leagues.
Statistical evaluation utilizing pooled seasonal player records alongside unique-player analyses to control for repeated observations across seasons.
Significant relative age effects were detected across pooled observations (p < .001; Cramér's V = 0.085) and confirmed in the unique-player cohort (Cramér's V = 0.085).
Season-level estimates expanded during the early observation seasons before stabilizing, showing no continuous linear amplification across the 25-year timeframe.
Temporal trajectories differed substantially across leagues, influenced by cohort replacement, athlete mobility, and youth developmental cutoff rules.

Cite This Study

Torrent et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd3c76b95aff0620eaed2 https://doi.org/10.1080/24733938.2026.2728065

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September 5, 2026Science and Medicine in Football

Temporal trends in the relative age effect in five major European men’s football leagues, 2000–2025

View Full Paper

Ask AI

Bookmark

Authors

JTJeremy Torrent LRLoric Rossier

Discussion

Member takes

Overview

Longitudinal study uncovers relative age effect stabilization in elite European footballers, suggesting persistent developmental selection bias across professional leagues.

Key Points

To determine the temporal progression and stability of the relative age effect across five major European men's football leagues over a 25-season window.
Longitudinal analysis evaluating birthdate distributions across 25 seasons (2000–2025) in five major European men's professional football leagues.
Statistical evaluation utilizing pooled seasonal player records alongside unique-player analyses to control for repeated observations across seasons.
Significant relative age effects were detected across pooled observations (p < .001; Cramér's V = 0.085) and confirmed in the unique-player cohort (Cramér's V = 0.085).
Season-level estimates expanded during the early observation seasons before stabilizing, showing no continuous linear amplification across the 25-year timeframe.
Temporal trajectories differed substantially across leagues, influenced by cohort replacement, athlete mobility, and youth developmental cutoff rules.

Cite This Study

Torrent et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd3c76b95aff0620eaed2 https://doi.org/10.1080/24733938.2026.2728065

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