1. It takes a long time for football players to grow up and become successful. In order to give players of different ages a fair chance to show themselves, it is necessary to divide them like this. Otherwise, the competition between adults and minors is obviously unfair.
2. To select and reserve talents for the national team through the competition between the national youth team and the Olympic team;
3. Meet the needs of the worldwide football system. For example, only the Olympic team can participate in the Olympic Games (under the age of 23), and Asian junior teams can only participate in the World Youth Championship after they have achieved a certain ranking.