That was over 8 years ago in 2013.
Today he is 56, and has starred in 100 movies in total, 20 since Iron Man 3 was released.
In Iron Man 3, I think Robert Downey Jr. looks:
Iron Man 3 scores 6.8 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.