Carlos Sainz Jr.
At 14, Carlos Sainz Jr. was tipped to be a real star in motorsport, and that has come true, showing his class many times in his F1 career so far.
The Spaniard was competing in European KF3 series and won the Junior Monaco Cup (as you can see in the first picture).
This victory would grab Red Bull's attention and get the son of the WRC champion signed for 2010 in single-seaters. He'd make his Formula 1 debut in 2015, driving for Toro Rosso, Renault and now McLaren.
Lando Norris
Forgive me if the first picture isn't from 2009, but photos of Lando Norris are extremely hard to find from back then, as he was only 9-years-old.
Norris will become the youngest driver on the F1 grid at the first race in Australia, but ten years ago, he was karting in the British leagues, despite initially being interested in motorcycles.
Lando would win the World Karting Championship in 2013, before moving to single-seaters and flying up the ladders to finish runner-up in F2 this year.