👉 In the context of education, a schoolgirl is typically an adolescent girl who attends a secondary or junior school. Schoolgirls are usually under 15 years old and can range in age from 10 to 18. They are often referred to as "girls" because they are the younger half of their gender, which is why some educators may refer to them as "girls". While they are not typically considered "boys", it is possible that there are some schools where boys