Like let me try and whip up a list of canonical adults in this universe right now...

Steve Rogers
Carol Danvers
Tony Stark
Pietro Maximoff
Wanda Maximoff
Natasha Romanov
Clint Barton
Janet Van Dyne
Hank Pym

Steve is dean of the academy, Hank Pym runs the school's science department, Natasha heads the hand to hand combat classes, and everyone else is currently in the Avengers with Tony leading.