At what age is a player required to choose a national team if summoned by a national member federation?

The requirement for a player to choose a national team if summoned by a national member federation is set at eighteen (18) years of age. This age is significant as it coincides with the transition into adulthood in many countries, allowing players to make more informed and mature decisions about their professional careers and commitments to national representation. At eighteen, players are expected to have developed enough skills and experience to contribute effectively to a national team, making this age a standard benchmark for eligibility in international competition.

Younger players may still be eligible for participation in youth national teams, but by eighteen, they are fully expected to make their choice regarding national representation if they receive an invitation. This age requirement also helps the national federations ensure that players participating at the international level have the necessary physical and mental maturity to handle the pressures and responsibilities that come with representing their country on the global stage.