Some mutants die in the X-Men. Some get better. Some age out of the X-Men. Some age backwards. Some get brought into the future. Some are brought into the past. Sometimes a movie comes along and lets people imagine a continuity wherein ages and admission times are defenestrated and we can have an actual conversation about what's best for telling stories about Xavier's School.
EXAMPLES!
In X-Men TAS, All X-Men are adults and Jubilee is a student.
In X-Men Evolution, Storm, Beast, Wolverine are adults, while Scott Summers, Jean Grey, and Nightcrawler are students.
In X2: X-Men United, Nightcrawler, Cyclops, and Jean Grey are adults, while Iceman, Rogue and Pyro are students.
In X-Men Apocalypse, Beast is an adult, and Storm, Cyclops, and Jubilee are all students.
Given the ability to move time and characters around, who works best as a student of Xavier's in order to tell stories about being a student at Xavier's? Who works best as a graduate? Who works best as a teacher? Who works best as a hero?
Have fun, go crazy. BBL.