when [someone] was a teenager
Tom era muito magro quando era adolescente.
Tom was very thin when he was a teenager.
Eu batia muita punheta quando era adolescente.
I used to masturbate a lot when I was a teenager.
Tom entregava jornais quando era adolescente.
Tom delivered newspapers when he was a teenager.
Kei fugiu para Tóquio quando era adolescente.
Kei ran away to Tokyo when he was a teenager.
— O Tempo com Você (2019)
Mary trabalhou como babá quando era adolescente.
Mary worked as a babysitter when she was a teenager.
Você leu muitos livros de mistério quando era adolescente?
Did you read a lot of mystery books when you were a teenager?
— Memórias de um Assassino (2003)