David McCallum, the 90-year-old actor who portrays Ducky Mallard on NCIS, will not be appearing in as many episodes in the future due to his age and living in New York. The producers of the show have stated that there are no immediate plans to stop the popular procedural, and they are acting as if it will continue. Season 21's filming has been put on hold due to ongoing strikes, and viewers may have to wait until 2024 for new episodes. The strikes are a result of labor conflicts with major studios, and writers and actors are demanding better pay and conditions.