One challenge in setting Captain Marvel 20+ years in the past is making sure the performers look the appropriate age. Fortunately, the MCU has mastered the art of de-aging via special effects as first seen in the first Ant-Man film and later in Captain America: Civil War. Speaking to Comicbook.com, Agents of S.H.I.E.L.D. star Clark Gregg joked or possibly hinted at this technology making another return for the film, saying:
That was a fun call from my friends in the Cinematic Universe who I normally see at these events, saying, ‘You know, we think once again we have some work for you, but it takes place in the ’90s. Can you go to the gym?’ Yeah, I said, ‘The ’90s? I mean, there is no gym that can get me back to the ’90s.’ And they said, ‘Well, don’t worry. We’ve been working on that technology, and we think we can goose you back a few years.
Now depending on how big Coulson’s role is in the film, it’ll be interesting how they work around such an expensive and notoriously time-consuming special effect. It’s possible that screentime could be lessened in favor of making the effect look better. Clark Gregg won’t be the only middle-aged actor playing a significantly younger version of their character. Samuel Jackson, Djimon Honsou, and Lee Pace will all be returning so a chunk of the cast may require some form of de-aging effect.
But let’s be real. These actors look ridiculously good for their age. You might not need even need de-aging technology to make them look young.