Despite being played by a then 27 year-old actress, dialogue in Civil War and Age of Ultron implies that Wanda Maximoff is younger than she seems and Dawson Casting is in play.
Clint: Ultron has these allies, these uh, kids, they're punks really. They carry a big damn stick and Nat took a serious hit. Someone's gonna have to teach 'em some manners.
Steve: She's a kid!
Clint: ...you can go to high school.
Do we know her exact age?