But as the second consecutive “X-Men film” in a row (i.e. not just Wolverine) to primarily take place in a period setting, the mutant franchise is revealing itself as something more. Intentionally or not, Singer, executive producer Lauren Shuler Donner, and everyone else involved with this franchise have gone back to the roots of these characters, as well as the Marvel superhero form in general, finding the Baby Boomer angst that writ them large on the pop culture imagination for 50 years and counting.
While superheroes are a defining piece of the 21st century cinema landscape, their origin is still thoroughly rooted in the 20th century—with a careful distinction between DC’s Golden Age heritage and Marvel’s Silver Age grooviness—but there has been something lost in those recent translations. Until now. By setting X-Men: Days of Future Past in 1973, after the previous team entry of X-Men: First Class was placed in 1962, 20th Century Fox may have stumbled upon the most pure and undiluted superhero franchise currently vying for box office attention, an aspect that allows their X-Universe to continue standing a world apart from everything else. read more at: http://www.denofgeek.us/movies/x-men-days-of-future-past/235812/why-x-men-days-of-future-past-could-only-work-in-1973