Students who are good by their early teens get more advanced training.

By his teens, he had begun thinking of himself as both special and different.

By their early teens, both recalled, they were falling in love.

By his teens he was winning consistently against players much older than himself.

The show was the first to be produced, directed, and written entirely by teens.

By his late teens, Simpson was winning local individual time trials.

By their mid teens they wanted to formulate themselves as a group.

But by his late teens, he needed no lessons.

By his early teens he was painting murals on buildings in the city.