[Conan the Librarian]

John Wayne didn’t die for 3 years after this movie. He was still going strong after the movie was made.

https://en.wikipedia.org/wiki/John_Wayne_filmography

It was, however, his last Movie.

[Vigilanteman]

Slowly dying of cancer is not the same as going strong. I'm glad he had three more years, but he stopped filming for a reason.

Even George Burns had cameo roles after he retired.