Yeah, and it can be kind of hard to introduce an adult cast member to the young party without really throwing off dynamics and relationships of the team, especially in a game like Persona. It could be done, but it would be tricky. I think they're actually doing a good job of it by setting up the Shadow Operatives and such. If the entire organization is made up of approximately university-level students, that gives great potential for some older characters fitting in with the situation already.