However, some of the names frequently mentioned as contenders include:
* Norman Lloyd: At 106 years old, Lloyd appeared in over 60 films and is considered one of the most prolific actors in film history.
* Christopher Lee: The legendary actor appeared in over 250 films, including iconic roles in the "Lord of the Rings" and "Star Wars" franchises.
* Robert De Niro: With a career spanning over 50 years, De Niro has appeared in over 90 films and is a widely acclaimed actor.
* Michael Caine: The British actor has over 150 film credits to his name and is known for his versatile roles.
* Clint Eastwood: Eastwood is known for his roles in Western films and has a prolific career with over 40 films as an actor and over 30 as a director.
It's worth noting that these numbers only reflect films with theatrical releases and don't include television appearances, short films, or other media. Also, many actors with extensive careers have appeared in countless uncredited roles.
Ultimately, it's a tricky question to answer definitively, but these actors all stand out as having incredibly prolific careers with a vast number of film credits.