A story (maybe tv show) that focus on the Xavier school as an academy with different classes of mutant (students between 15 and 25 years old), their teachers and staff.
The idea is not necessarily to be super close to the comics, characters can shift in age, but we somehow respect the difference between new and old X-men characters (For examples: Cyclops will not be a student and Kid Omega a senior teacher). Most famoux x-men will be teachers/mentors/staff/trainers and younger ones will be students.