Grave: This is AI. atleast i have a HUMAN SOUL, so i am actually ALIVE, unlike this stupid clanker.
Mettaton: And im a ghost possessing a robot.
Queen, spamton and tenna:...
Why do you trust anything that ai says?
Besides, it never tells us anyone's age in Undertale or Deltarune. It can be assumed that the school kids in Deltarune are currently high schoolers.