"Don't Let the Old Man In" is a song written and recorded by American country music singer Toby Keith.

It appears on his 2019 compilation album Greatest Hits: The Show Dog Years, and is also featured in the 2018 film The Mule.

Keith met actor-director Clint Eastwood at a charity golf tournament in Pebble Beach, California, in 2018.

[2] Olson also thought that the song's central theme of old age was appropriate to the plot line of The Mule, which is about an elderly person becoming a drug courier.

Eastwood liked the recording and decided to put it in The Mule, feeling that the raspy delivery fit the mood of the song and the movie.