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8th grade is normally the last year of middle school, and most kids are 14 years old at the end of that year, except for the youngest ones with summer birthdays who are still 13. There are still some places that have "junior high school" rather than middle school, which is grades 7-9 instead of 6-8 or 7-8. So in that case the kids finishing 9th grade and leaving junior high would be 14 and 15 years old. But although that used to be the norm back in the day, most school systems nowadays do not do it like that.

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13y ago

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