Johan Dahl Jensen is the third child of Robert Jensen and Ulla Dahl. He was born 29 April 1998. He has older sister Anna Dahl-Vestergaard from 1995, older brother Lasse from 1997, younger brother Jacob from 1999 and younger sister Laura from 2000. He lives on Frederiksberg, Copenhagen, Denmark. He is the boyfriend of Frederikke Nielsen.
In 2001, when he was 3, he started nursery at Børnehuset Ved Skoven, Ballerup, Copenhagen.
In 2004, when he was 6, he started Egebjergskolen in Ballerup, Copenhagen, Denmark.
In 2014, when he was 16, he started hhx at Niels Brock Gymnasium, Frederiksberg, Copenhagen, studying Business Elite with Danish, English, Maths, Business Economics, International Economics, and Marketing at level A.