This one was a bit tough. The best I could come up with was The Curse of the Demon (1958, 83m, Columbia) which starred Dana Andrews as a "Stuffy cynical psychologist who doesn't believe that a series of deaths of been caused by an ancient curse". One of his co-stars was 70, so she may have qualified as a "prune". Based of Montguae R. James book Casting the Runes