Born in Montreux, Switzerland, Juvet grew up in nearby La Tour-de-Peilz, with his parents, Robert and Janine, his brother Daniel, and his sister Nancy. Juvet's father sold radios and televisions, which sparked an early interest in music for the young Juvet. Juvet began studying piano at age 7; later he developed an interest in the music of The Beatles.

Juvet moved to Paris in 1968 at the age of 18 with little money. A friend encouraged him to become a model in Germany, and Juvet pursued this career in Düsseldorf, Germany, for two years. He returned to Paris in 1970.