Why Captain Marvel Does Not Age In Avengers 4

Brie Larson (Captain Marvel) played by seasoned actor Carol Danvers is set to make her MCU debut in just a few months as Captain Marvel  before reappearing on the screen again in Avengers 4.

Although this can be extended if the rumored time jump on Avengers 4 are proven to be true, the bulk of the gap comes on Captain Marvel's end. In order to tell Carol's origin without worrying about most of the MCU's ongoing canon, Marvel Studios and directors Anna Boden and Ryan Fleck are going to introduce Carol in the 1990s.
 This decision came as a surprise, but fans have been debating what it means for Carol's Avengers 4 role and look ever since. With Captain Marvel taking this route for Carol, it will mean that she'll have barely aged at all between the time of her accident and when she arrives back on Earth. 
The events of her solo movie are not expected to span too much time either, although it is also unknown how long ago her accident was and how long she's been working with the Starforce as a result. Even if that is a few years, Carol looks to have barely aged a day. Jumping forward another twenty years or more to Avengers 4's place in time may not change her look too much either. But the more important aspect of her slowed aging is that it means Carol can still be alive, active, and very much in her prime when she gets to Nick Fury.