[1] He attended stage camps in his youth and performed for the first time when he was in Year 7 at school and was cast as Mike Teevee in a production of Charlie and the Chocolate Factory.
After leaving Leighton Park School he attended Mountview Academy of Theatre Arts for his BA training after winning a BBC scholarship.
[5] Gage created the role of Romeo Montague in the Max Martin jukebox musical & Juliet at the show's world premiere at the Manchester Opera House between 10 September and 12 October 2019 and remained a part of the cast when it transferred to the Shaftesbury Theatre on 20 November.
[15] On 7 November, it was announced that Bonnie & Clyde would be returning to the West End on 4 March 2023, though this time at the Garrick Theatre, with Gage and McCann reprising their roles.
[17] He played the title role in a special Halloween concert performance of Bat Boy: The Musical at the London Palladium on 31 October 2023 alongside Trevor Dion Nicholas, Victoria Hamilton-Barritt, and his Bonnie & Clyde co-star Jodie Steele.