since I was a child
Es extraño, no me he peleado con nadie desde que era niño.
It's strange; I haven't gotten into a fight with anyone since I was a child.
— Caché (Escondido) (2005)
No había vuelto desde que era niño.
He hadn't been back since he was a child.
— Sympathy for Mr. Vengeance (2002)
Since I was a child.
Tom conoce a Mary desde que era niño.
Tom has known Mary since he was a child.