since childhood
僕たちは子供のころからの知り合いです。
We've known each other since we were kids.
彼との子供のころから仲良しだ。
I've been close friends with him since childhood.
私たちは子供のころからお互いに知り合いです。
We've known each other since we were children.
トムは子供のころから他人に全く興味がなかった。
Tom has never had any interest in other people, even since he was a child.
私は彼女が子供のころから知っています。
I've known her since she was a child.
私は子供のころからトムを知っている。
I've known Tom since I was a child.