Teenager (noun)

1. A young person between the ages of 13 and 19 years.
2. An adolescent who is between the ages of 13 and 19 years.
3. A young person who is still a teenager.
4. A person who is undergoing the process of teenage development.
5. A young person who is in their teenage years.

Origin:

Early 20th century: blend of teen + -ager.

Examples:

1. She is a typical teenager, full of energy and ideas.
2. Many teenagers are eager to learn how to drive.
3. Teenagers can be moody and unpredictable.
4. The teenager was too young to vote.
5. Teenagers today have more freedom than ever before.