Born in Kuala Lumpur, Gilbert began his racing career in 2002 in karting, where he was active until 2010.

While his teammates Lynn and Oliver Rowland ended the season first and second, respectively, Gilbert was fifth in the championship, including a victory at Croft.

With two victories on the TT Circuit Assen and Lausitzring, he finished fourth in the championship behind Jimmy Eriksson, Lucas Auer and Kimiya Sato.

At the end of the season he also took part in the Macau Grand Prix for Mücke Motorsport, where he finished eighteenth.

He competed in five rounds and was replaced twice with Luca Ghiotto and Patrick Kujala having failed to score a point.