also: オーバーエージ
noun
overage player
In sports, a player older than the age limit for a youth tournament, typically over 23 in an under-23 competition. Often used in contexts like Olympic football.
オリンピックのサッカーでは、オーバーエイジ枠で3人の選手を選べる。
In Olympic football, up to three overage players can be selected.
Since he is over 23, he was registered as an overage player.