A seventeen-year-old girl is a successful student at school.

Thirteen students are in the classroom.

A fifteen-year-old child

Eleven students were successful in the exam.

I traveled abroad for the first time when I was sixteen.

A nineteen-year-old girl is getting ready to go to college.

A year passes every twelve months.

We will celebrate on the eleventh day.

Today is the thirteenth day.

We will celebrate on the twelfth day.