Quiz! Can you name the most expensive teenagers ever?
Age is no limit for these players, who all commanded hefty fees before the age of 20
You have 10 minutes to guess 50 players.
Remember to tweet your scores @FourFourTwo, and challenge some friends while you're at it.
THEN TRY Quiz! Can you name the top 10 goalscorers in Europe every year since 2000?
For some players, age is no barrier. There are stars who burst onto the scene at an early age and look the finished product already.
Take Michael Owen – who doesn't make it onto today's list, given that he was well into his 20s by the time he left Liverpool. It was scarcely believable that he was only 18 back in 1998, scoring that wonder goal against Argentina with a squad number on his back higher than his tender years.
The value of such prodigies has only risen in recent years. The most expensive players to buy right now? They aren't a Messi or a Lewandowski, with all due respect to those two. They're a Foden or a Saka.
Plenty of footballers have made the definitive move before they turn 20 and this list is a compendium of great players and… not so good ones. But who's on it?
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Mark White has been at on FourFourTwo since joining in January 2020, first as a staff writer before becoming content editor in 2023. An encyclopedia of football shirts and boots knowledge – both past and present – Mark has also represented FFT at both FA Cup and League Cup finals (though didn't receive a winners' medal on either occasion) and has written pieces for the mag ranging on subjects from Bobby Robson's season at Barcelona to Robinho's career. He has written cover features for the mag on Mikel Arteta and Martin Odegaard, and is assisted by his cat, Rosie, who has interned for the brand since lockdown.