What term is used to describe a young person ages 12 to 18 years?

The term "adolescent" accurately describes a young person ages 12 to 18 years. During this developmental stage, individuals undergo significant physical, emotional, and social changes as they transition from childhood to adulthood. Adolescence is characterized by exploration of identity, greater independence, and the development of more complex relationships. This term encompasses the specific age range of 12 to 18, aligning with various definitions used in education, psychology, and healthcare.

In contrast, the term "child" typically refers to a younger individual, usually under the age of 12, while "young adult" generally denotes individuals aged 18 or older, often transitioning into full adulthood. The term "preteen" describes individuals who are just before reaching their teenage years, typically those between 9 and 12 years old. Thus, the label "adolescent" is the most fitting for the age group of 12 to 18 years.