The Over-the-Hill Gang Rides Again (1970)

Four retired Texas Rangers -- Nash Crawford (Walter Brennan), Jason Fitch (Edgar Buchanan), Amos Polk (Andy Devine), and Gentleman George Agnew (Chill Wills) -- leap to the aid of their old chum the Baltimore Kid (Fred Astaire). The Kid has become a hopeless drunk, and they aim to clean him up and install him as marshal of Waco, Texas. But in order to complete the job, the geriatric quartet will have to help the Kid defeat the outlaw gang that wants him dead.