What grade are fifteen year-old's in?
Generally they are in the Ninth Grade, where the average age of students are usually 14–15 years old. In the United States, it is often called Freshman year.
In the USA, a 14-15-year-old is usually in 9th grade or their freshman year of high school, and a 15-16-year-old is in 10th grade or their sophomore year. But some schools put ninth grade as the last year of junior high rather than the first year of high school.
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