WandaVision. So how old is the character throughout her arc thus far?
Olsen's first starring role came in Pietro, aka Quicksilver, was killed, Wanda ed the Avengers under the pseudonym Scarlet Witch, making her one of the youngest .
Wanda and Pietro's birthdate was never directly stated in the MCU, but it's still possible to gauge Scarlet Witch's age throughout her various appearances. The twins were 10-years-old when the Stark-manufactured bomb decimated their home, killing their parents. Considering Tony moved away from producing weapons in the years surrounding Iron Man, it can be assumed that Wanda and her brother were around 10 in 2008. If they were born somewhere between 1998 and 2000, Wanda would currently be between 18 and 20-years-old in the franchise.
Scarlet Witch's Age Can Be Narrowed Down Based On Key Details
Believing that Scarlet Witch is only late teens or early twenties might be a bit difficult for some viewers to accept considering Olsen is over 30. Granted, this age range actually fits in with certain evidence provided in the films. When Wanda was struggling with fighting on the frontlines in Age of Ultron, Captain America: Civil War, Steve Rogers referred to Wanda as a "kid," which was also accurate since she would have still been in her late teens in 2016.
Based on the tactic of narrowing down Wanda's age, Wanda would have remained in the 18-20 range throughout Thanos' Snap. Endgame primarily took place in 2023, but when Scarlet Witch and the others were brought back, they never aged. It's unclear how much time will have ed when Olsen reprises her role in WandaVision. Unless any time jumps occur, Wanda will be reaching her early twenties for the MCU's foreseeable future.
