User blog comment:LoveWaffle/Ranking 2013's Superhero Movies/@comment-26711120-20140115181923/@comment-1895174-20140117172018

Scott Summers is in high school in Origins, so he's 14-18 years old in 1981 (which, by the way, is when that movie thinks the Three Mile Island incident happened), probably closer to the tail end of that. Jean Grey is a child in the flashback at the beginning of The Last Stand, which is in the mid-to-late 80s, so at least five years after the events of Origins. Scott's in his early 20's before Jean Grey's even entered middle school.