since childhood
Fue mi especie favorita desde niño.
It was my favorite species since I was a child.
Conocía a Mallory O'Brien desde niño.
I had known Mallory O'Brien since I was a child.
— Los muertos no mueren (2019)
So he's been stealing since he was a child.
— Quieto, muere, resucita (1990)
Yo sé tocar la guitarra desde niño.
I've known how to play the guitar since I was a child.