seit seiner Kindheit

since his childhood

→ seit
phrase Rare #42,770
since his childhood Used when referring to a male person's childhood.
GE: Seit seiner Kindheit spielt er Klavier.
EN: He has played the piano since his childhood.

Das macht Tom schon seit seiner Kindheit.

Tom has been doing this since he was a child.

Tom lebt schon seit seiner Kindheit in New York.

Tom has lived in New York since he was a child.

Seit seiner Kindheit macht er das.

He’s been doing that since he was a child.

— Mother (2009)

Ich kannte Chris Reilly seit seiner Kindheit.

I've known Chris Reilly since he was a child.

— The Wind That Shakes the Barley (2006)

Er war seit seiner Kindheit zierlich.

He had been slight since childhood.