Youngster (noun)

1. A young person, especially a child or a youth.
2. A young animal, especially a horse.

Origin:

From young + -ster, first recorded in the late 16th century.

Examples:

1. The youngsters in the park were playing a game of soccer.
2. She has been working with youngsters for over a decade.
3. The trainer is trying to turn the youngster into a champion horse.
4. The youngster has a lot of potential, but needs more experience.
5. The school is trying to provide a safe and supportive environment for the youngsters.