Robert Downey Jr. was 49 in Avengers: Age of Ultron when he played the character 'Tony Stark / Iron Man'.
That was over 8 years ago in 2015.
Today he is 58, and has starred in 119 movies in total, 15 of those since Avengers: Age of Ultron was released.
In Avengers: Age of Ultron, I think Robert Downey Jr. looks: