(MASH movie cast)
Two of those were in Harold and Maude. One is easy for fans of the movie, but can you name the other? Checking the cast list surprised me. Quite a few still alive. (Not counting the ones who only made a handful of movies and may have just disappeared.)
Vivian Pickles who played Harold’s mom is still alive at 92 but she hasn’t done anything per IMDb since 1999. Ellen Geer (daughter of Will) is still alive (age 84) and has a credit from 2020 in Better Things.