These three guys have been being close friend each other since their childhood.

And of course he had known her since his childhood.

They were close in age, had known each other since childhood.

He had worked at one job after another since early childhood.

Or call her by any other name than the one he'd used since childhood.

She is a special friend because we are friends since childhood.

This had been going on for years, ever since my early childhood.

Someone I have known since my childhood was also killed.

But a lot of things have changed since my childhood.

It was as if he'd been using them since childhood.