That was over 24 years ago in 1998.
Today he is 56, and has starred in 100 movies in total, 64 since U.S. Marshals was released.
In U.S. Marshals, I think Robert Downey Jr. looks:
U.S. Marshals scores 6.2 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.