The World Cup is arguably the world's biggest football stage, and a great chance for many youngsters to achieve some huge milestones.
There are quite a few teenagers taking part this year in Qatar, among them Barcelona starlet Gavi. The midfielder, who just turned 18 earlier this year, was included in Luis Enrique's starting XI in alongside veteran Sergio Busquets and fellow youngster Pedri.
Enrique has been keen on incorporating youngsters into his team, with La Furia Roja boasting the likes of Ansu Fati, who, like Gavi and Pedri, also plays for Barcelona, and 19-year-old Alejandro Balde, who received a call-up to the squad following an injury Valencia's Jose Gaya.
Gavi might have just turned 18 in August, but he already has two goals at senior level to his name. In making his debut for Spain against Costa Rica, he now becomes the youngest ever debutant for Spain at a World Cup, breaking the long-standing record set by Cesc Fabregas.