Notable for his role as Jack in the 2014 film Hector and the Search for Happiness, Longworth also appeared during his childhood years in episodes of the television shows Intruders and Supernatural. In addition, he was cast in the title role in the 2015 thriller The 9th Life of Louis Drax.
Early in his acting career, he appeared in a 2012 video sequel to the classic holiday movie A Christmas Story.
He starred in a 2015 short film titled Arthur.
He was born in Vancouver, British Columbia, Canada. His older brother, Rowan Longworth, also had a childhood acting career.