What do you think about a 7th grader and an 11th grader?

SO I know some kids who are going out and.. well the girl is in 7th grade and the guy is in 11th.. she's 13 and he's 17. They really love each other and don't have a sexual relationship.. These guys are my friends and I don't know what to do? Do you think this is gross or okay?
What do you think about a 7th grader and an 11th grader?
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