at thirteen years old
Tom fugiu do orfanato aos treze anos.
Tom ran away from the orphanage when he was thirteen years old.
Tom começou a estudar francês aos treze anos.
Tom started studying French when he was thirteen.
Deixar o lar aos treze anos para se tornar bruxo.
Leaving home at thirteen to become a wizard.
— O Serviço de Entregas da Kiki (1989)
Tom aprendeu a dirigir aos treze anos.
Tom learned to drive when he was thirteen.
Ela saiu de casa aos treze anos de idade.
She left home when she was thirteen years old.
Eu comecei a fazer isso aos treze anos.
I started doing this when I was thirteen.
Eu comecei a tocar clarinete aos treze anos.
I started playing the clarinet when I was thirteen.