Ezra Miller was 27 in Zack Snyder's Justice League when they played the character 'Barry Allen / The Flash'.
That was over 3 years ago in 2021.
Today they is 31, and has starred in 21 movies in total, 4 of those since Zack Snyder's Justice League was released.
In Zack Snyder's Justice League, I think Ezra Miller looks: