* Counting every film role: This would include short films, TV movies, documentaries, etc. It's likely over 100.
* Focusing on feature films: This is a more common way to count, and it would still be a significant number, probably over 50.
To get a more accurate count, you can check resources like:
* IMDb: This website has a comprehensive list of Robert Downey Jr.'s filmography.
* Wikipedia: The Wikipedia page for Robert Downey Jr. also lists his films.
It's safe to say he has been a very prolific actor!