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The story never gives a specific age for the students, but all characters are 18+ in this story. So, no one is younger than 18, but I would say that none of the students are older than 25. The location is also never specified, so it could be an an elite 4 year university, a two year college, a graduate program, or heck, this is a science fiction story where people can shrink. You can have it take place in some brand new 1 year educational system that only eighteen year-olds go to. Again, it's whatever you want.