That was over 9 years ago in 2012.
Today he is 56, and has starred in 100 movies in total, 22 since The Avengers was released.
In The Avengers, I think Robert Downey Jr. looks:
The Avengers scores 7.5 out of 10 on The Movie Database.
Robert Downey Jr.'s first acting role was as 'Puppy' in Pound, released in 1970 when he was 5.