Invite everyone to a discussion to decide how to proceed. Give everyone a chance to talk about their preferences, what they expect from the game, and see if there's a chance of finding a middle-ground that is acceptable for all of them.If you were behind my DM screen, how would you proceed with this situation?
If you were behind my DM screen, how would you proceed with this situation?
Retreater
What game is it?
It's not the play styles that are not meshing. The older group is the one telling the younger group to run their characters according to how the older group thinks those characters should be run.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.