He is a teenager. Isn't he? -Yes. He is 16 years old.

She has just become an adult.

she is under 60

He is over 20

A boy isn't an adult yet

How old is that creaker? - Under 90

he just turned 20

He is my twin brother

she is far beyond 40

Are you twins? -yes

She is my age

You are vestal yet.

She is far beyond 70

How old are you? - Almost 30