Duncan was born in Salt Lake City, Utah, but was raised in  Star Valley, Wyoming. Duncan graduated from Star Valley High School in 2020 and Western Wyoming Community College with an A.A. for Musical Theatre in 2022. Duncan is currently enrolled in The Conservatory for the Performing Arts at Stephens College to get a B.F.A for Musical Theatre in May of 2024. In his spare time, you can find him at Six Flags, listening to Taylor Swift and cooking for his friends.