If this movie takes place in the 90´s and Captain Marvel is featured in Infinity War does that mean she can't age due to her power? Or is Brie Larson gonna wear make-up to look like she's in her 40's for the Avengers-films?

They're not costumes per se (It's explained in the film)

Coincidentally, Benedict Wong stars in The Martian, too. This time around without screwing up. He learned from his mistake.

the ethics of spending what must be billions of dollars to rescue one astronaut, when the same money could potentially save many thousands of lives at home.