sentences:  To date Northern Ireland haven't yet qualified for the finals tournament.The national under-21 team is the highest level of youth football in Northern Ireland, and is open to any players who were born in Northern Ireland or whose parents or grandparents were born in Northern Ireland.This team is for Northern Irish players aged 21 or under at the start of a two-year European Under-21 Football Championship campaign, so players can be, and often are, up to 23 years old.