Justin Elmquist was born in 1998 in Hamburg, where he grew up. From an early age, he was captivated by acting, participating in various clubs during school and pursuing his first projects in high school, including taking part in the "Theater der Welt" project in 2018. After graduating, he embarked on a two-year world journey that took him to New Zealand, Australia, Indonesia, and the Philippines. In New Zealand, he worked as a waiter and in landscaping, where he met two actors who left a lasting impression on him.

Upon returning to Germany in 2021, he initially felt intimidated by the acting industry and set his dream aside to begin an apprenticeship as a carpenter, which he eventually abandoned to pursue his passion. He successfully completed his acting training at the School for Acting Hamburg in 2024 and now works as a freelance artist. He has also performed at the Hamburger Kammerspiele.