Adolescent (noun)

1. A young person aged between puberty and adulthood.
2. A young person who is developing from a child into an adult.

Origin:

Early 17th century: from latin adolescent- "growing up", from the verb adolescere, from ad- "to" + alescere "grow".

Examples:

1. Adolescents often have difficulty communicating with their parents.
2. He is going through the difficult adolescent stage.
3. She is an adolescent girl.
4. Adolescent boys are often very active.
5. The adolescent years are a time of rapid physical and emotional change.