be in one's teens

The members were in their late teens at the time.

The relationship began when they were both in their teens.

She died in her teens, no longer a child but not yet a woman.

At the time, he was still a college student in his late teens.

Later, we see those same young people in their teens and 20's.

A boy in his early teens, a girl of perhaps five or six their own children.

We got young guys in their teens all the way up to something like 35, 36 years old.

I had never come close to getting numbers in the teens before!

There were two kids with her, one girl about five or six and a boy in his early teens.

He was young, maybe in his early teens, but not likely.