#3 Ousmane Dembele- 18 years, 9 months and 20 days
Before injuries began to plague him, Ousmane Dembele was one of the most highly-rated youngsters in French football. The fleet-footed winger was handed his Ligue 1 debut in November 2015 by Stade Rennais and emerged as one of the top talents within months of his debut.
Dembele also became the youngest player to score a league hat-trick for Stade Rennais. He did so in their 4-1 win over Nantes on Matchday 29 of the 2015-16 season.
His performance for Stade Rennais saw him earn a move to Borussia Dortmund, from where he moved to Barcelona for a then club-record fee. Dembele is one of the world's top wingers despite his constant injury problems.
#2 Kylian Mbappe- 18 years, 1 month and 22 days
From his breakout campaign at AS Monaco, Kylian Mbappe quickly distinguished himself as a generational talent. The Frenchman made his debut for the club aged only 16 in 2015. He became the club's youngest-ever player in Ligue 1 and their youngest-ever goalscorer in 2016.
Mbappe scored his first career hat-trick in December 2016 in the Coupe de la Ligue against Rennes. Shortly afterwards, he scored his first Ligue 1 hat-trick in a 5-0 drubbing of Metz at the Stade Louis II. Mbappe benefitted from playing alongside Radamel Falcao in his breakthrough season and earned a move to Paris Saint-Germain shortly after.
Mbappe played a starring role for the French national team in their victorious 2018 FIFA World Cup squad, scoring four goals in the tournament.
#1 Jeremy Menez- 17 years, 8 months, and 15 days
Jeremy Menez signed his first professional deal with Sochaux in 2004 aged 16, making him the youngest-ever professional footballer in Ligue 1. He made his professional debut on the opening day of the 2004-05 season against Ajaccio and remained a regular for the side.
Menez scored his first goal for the side in November 2004 and two months later became the youngest player to score a hat-trick in Ligue 1 history. A 17-year-old Menez scored three goals in a seven-minute spell against Bordeaux in a 4-0 win. He went on to play for AS Monaco, AS Roma, PSG, AC Milan, and Bordeaux, and currently plies his trade with Serie B side Reggina.