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quando tinha três anos

when [someone] was three years old

→ quando
phrase Rare #37,426
when [someone] was three years old Used to talk about an age in the past. The subject is often understood from context.
PO: Ela aprendeu a ler quando tinha três anos.
EN: She learned to read when she was three years old.

Tom veio para o Japão pela primeira vez quando tinha três anos de idade.

Tom first came to Japan when he was three years old.

Você começou a aprender piano quando tinha três anos, como Mozart?

Did you start learning piano when you were three years old, like Mozart?

Quando tinha três anos, ele caiu das escadas e parou de crescer.

When he was three years old, he fell down the stairs and stopped growing.

— O Tambor (1979)

Seu pai morreu quando tinha três anos.

His father died when he was three years old.

Tom perdeu os pais quando tinha três anos.

Tom lost his parents when he was three years old.