I think it was GulfportDoc who said that in Cry Macho Clint's voice seemed so weak he could verily raise it above a whisper. I've seen both The Mule and Cry Macho and I'd say in the time between Clint's health has aged and his limitations are just from being very old. I really noticed a big difference in him between the two movies.

But you know he made a movie in his 90s so that's still pretty cool.