Not sure an accurate portrayal of the behavior of and the horrors that the American daylight bomber crews experienced on a daily basis would be appreciated or appropriate for viewing of children..but it's hollywood..
It's true for all information -- as a parent, you are always making judgements of what is suitable for your kids at a particular age.
I watch Masters of the Air, and judge episode by episode what my kids could watch. Episodes 1 and 2, I judge OK. I might not for other episodes. We'll see. In the war genre, there is a range from stuff like Baa Baa Blacksheep (relatively tame) to Black Hawk Down, Full Metal Jacket, etc. (not tame). Along that spectrum, people make judgements.
I want them to learn history and reality. Here, I like them to see courage, responsibility, and competence of young people only a handful of years older than themselves. What is involved in war (up to what I judge is age-appropriate, of course). And some of the things that have to be considered in war.
These days, public schools (as I know from much direct experience) are battle zones for indoctrinating kids into particular ideologies. If there is something that will teach my kids aspects of history that some teachers -- because of agenda -- would not cover; and I think it is OK for them to see it; and I think they might really watch it (as opposed to cursorily watch and then forget all about it because they don't care) -- I take that opportunity.
Episodes 1 and 2 of Masters of the Air would have been OK for me at 13 also. I was a big WWII aviation enthusiast from an early age. I read every WWII air-combat book I could get my hands on. I enjoyed it, and it gave me an appreciation of that history and what people went through.