Issue number 374 of the CIES Football Observatory Weekly Post ranks 60 leagues worldwide according to the percentage of minutes played since the 1st of January 2021 by footballers that did not yet celebrate their 21st birthday at matches played. The greatest figures were recorded in the Venezuelan (18.8%) and Danish top divisions (16.5%). The Saudi Pro League is at the opposite end (1.6%).
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Raffaele Poli
Roger Besson
Loïc Ravenel
Thomas Gonzalez

Regarding the average age of line-ups fielded, the lowest values were recorded in the Croatian top division (25.3 years of age), the Mexican Liga Expansión and the Danish Superliga. At the other end of the spectrum are three non-European leagues: the Paraguayan top division (28.9 years of age), the Thai League 1 and the Primera División in Bolivia.

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% of minutes played by U21 players

Age on the pitch. Domestic league matches played between 01/01/2021 and 21/03/2022.