A sophomore in high school is typically 15 years old and in most states in the USA considered to be a child or a Minor.
When you look at the age difference, it doesn't seem that bad.
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Might be different for your friend though, since it's the other way around.
A freshman in college is typically 18 years old and an Adult.
sophomore college dating junior high school college freshman hihg high school junior isn was a senior and I was a sophomore.