Stripling
Part of speech: noun
Definition: A youth in the state of adolescence, or just passing from boyhood to manhood; a lad. A juvenile between the onset of puberty and maturity (syn: adolescent, teenager).
Teenager
Part of speech: noun
Definition: Literally, a person from thirteen to nineteen, an adolescent.
Example sentence: Being a teenager is an amazing time and a hard time. It's when you make your best friends - I have girls who will never leave my heart and I still talk to. You get the best and the worst as a teen. You have the best friendships and the worst heartbreaks.