We've been together since we were children/the very childhood?

BONNIE AND CLYDE
by David Newman & Robert Benton
отрывок:

BLANCHE -Well, that ain't what I heard.
BUCK -Now word of mouth just don't go, darlin', you gotta have the facts. Shoot. Why he and me growed up together, slept and worked side by side. (laughing) God, what a boy he was!
BLANCHE He's a crook.

BUCK is deliberately made to sound illiterate, he is, after all, white trash. The correct phrase would be: Why he and I grew up together.

:-))