If it's Legacy then they are probably all dead, I'm just completely flabbergasted that Professor X is still alive. He should have been dead ages ago especially with Logan showing signs of aging. Before Logan grew his first gray hair X would have been dead decades and by the time Rogue, Storm and Jean hit their 60's he would have looked like he did in DOFP.
I was thinking the same. Especially Jean. If Xavier could survive it somehow, surely she could. Of course she could have sacrificed herself for like the 5th time at some point before that lol