when [someone] was a teenager
Tom era muito magro quando era adolescente.
Tom was very thin when he was a teenager.
Li seu livro quando era adolescente, nunca esqueci o final.
I read your book when I was a teenager, and I've never forgotten the ending.
— A Grande Beleza (2013)
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)
Tom entregava jornais quando era adolescente.
Tom delivered newspapers when he was a teenager.
Mary trabalhou como babá quando era adolescente.
Mary worked as a babysitter when she 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)
Eu batia muita punheta quando era adolescente.
I used to masturbate a lot when I was a teenager.