How old are you in 12th grade?

School Age: How old are you in 12th grade?

The question we answer here is 'How old are you in 12th grade?' The answer applies to 12th grade students in the United States and assumes that the student was not held back a year, nor skipped a grade.

12th grade is the fourth and final year of high school in a K-12 system. 12th grade is the senior year of high school. Most students are 17 years old when they start 12th grade and turn 18 years old by the end of their 12th grade year or soon after.

Quick Summary Answer: 12th grade students age: 17 to 18 years old.

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