Stark’s daughter, Morgan, has only appeared in Avengers: Endgame thus far, where she was four years old for her entire screen time. “It worked?” Tony asks. “Yeah,” Morgan replies.
He was part of the very first roster of superheroes, co-leading the original team in 2012's The Avengers alongside Iron Man, Captain America, Black Widow, Hawkeye, and the Incredible Hulk.