Senior high school, also known as secondary school, high school, or senior secondary school, is the final stage of formal education for young people in many countries. In some places, it is known as sixth form or college. The term senior high school refers to the last two years of secondary education, typically for students aged 16-18 years old. Synonyms for senior high school vary depending on the region and educational system. In the United States, senior high school is often referred to as high school, while in the United Kingdom, it may be called sixth form or college. Other synonyms include secondary school, upper secondary school, lyceum, gymnasium, and senior secondary college.