I think is normal that they treat her like a kid. Someone on their early 20’s is often seen as a kid by the 30+,40+ that the others are, specially if you consider the power thing, with experience and such. So yeah, she might be 25 on Infinity War, 24 on Civil War and 22 on AOU, if this timeline is correct.

She is young, and yes, inexperience plays into the way the Avengers treat her. But the writers have said it’s also a matter of fear-born condescension. You can see it in the argument Steve and Tony have over the pens. When coming to a head about what Steve feels is internment and Tony feels is due caution, Tony defaults into dehumanizing Wanda, Steve defaults into infantilizing her.

Scarlet Vision Infinity War timeline theory

Including LEGO set spoilers and just about everything we know so far

The movie likely opens with Wanda and Vision staying together at this hotel in Edinburgh. After heading outside, they are attacked,

with the Mind Stone nearly successfully extracted from Vision,

leaving him injured.

But a timely rescue from Team Cap

allows them all to escape, and head back to the Avengers compound, with Vision still injured.

They meet up with Rhodey and Bruce and then head to Wakanda.

Shuri offers or agrees to help extract the Mind Stone (if the LEGO set is accurate) or help heal Vision.

Wanda and Vision stay with her as the rest battle Thanos’ army. It appears eventually things get dangerous enough that Wanda and Vision leave for the jungle, with Vision’s Stone still intact on his head, and Vision sitting on the ground, looking injured, and both know something is coming.

One last note, is that the Entertainment Weekly article mentions that Vision feels pain as the other Stones draw near–this could be inaccurate from them (because they do report some things wrong), but if so, it could mean that Vision was not damaged from the battle, but is reacting to the approaching Stones. Vision might be sensing them approaching, and that might be what Wanda is investigating here:

Wanda and Vision in Infinity War Trailer #2

Fandango Infinity War exclusive poster 2 of 5 (”Team Romance”)

marvel-feed:

NEW ‘AVENGERS: INFINITY WAR’ THEATRICAL POSTER!

Wanda and Vision in Infinity War Trailer #2

Wanda is 22 ?

Wanda is probably a bit older than some people are thinking! I’ve seen the idea that she’s still a teenager pop up surprisingly often lately, but she’s definitely not a teenager, and she wasn’t one in Civil War.

Christopher Markus and Stephen McFeely, writers of Civil War and Infinity War, have said so in this podcast (timestamp: 7:53):

Q: Let’s keep talking about Wanda for a second. One of the things that’s going on with the film is that everyone’s kind of treating her like a kid. I mean, she’s literally sent to her room, for a big chunk of the movie. And it made me think, how old is she supposed to be? Because Elizabeth Olsen isn’t a teenager.

A: No.

Q: It makes me think it’s just a lack of experience. Because there’s a generational aspect to this story that I think is really interesting.

A: We’re not saying she’s 16. It is just a lack of experience, and a level of condescension frankly, on some of their parts. Like “let’s put her in her room”. But it’s also a certain level, I think, of fear, because they don’t understand her power. She doesn’t understand it either, but they can’t quantify it. So the more childlike you make her the less of a threat she is, in a way.

We haven’t ever gotten a specific age on her, but I’m guessing more like 25 around the time of Infinity War. I think the fact that the costumers have felt comfortable giving her such big leaps in the “age” from the very youthful AoU, to the more college aged CW, to mom jeans:

indicates to me that she was never supposed to be so young that these costume-based age jumps would seem odd. Notably, every other character in the MCU has not aged in terms of clothing styles except for Wanda.