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The Marvel Cinematic Universe has played with time in ways that films rarely get to. When it comes to characters aging significantly onscreen, there are sometimes time jumps, such as in the Star Wars and Blade Runner franchises. But few film characters are a constant presence over a long period of time like the Avengers have been, with multiple heroes aging and maturing together.
So it’s appropriate that time travel has been a rumored plot device for Avengers: Endgame. Time travel provides the opportunity to end the Avengers’ stories, and possibly their lives, in a way that will allow them to pass the baton to the next generation of heroes.
From The Hollywood Reporter: