81-year-old millionaire Jack Watson switches bodies with his 18-year-old grandson David, leading the two to experience life on opposite ends of the age spectrum. But when David, trapped in Jack's aged body, ends up in a coma, his grandfather must use his meager knowledge of the youth to prevent his family from pulling the plug.

Lady Alyce Marshmorton must marry soon, and the staff of Tottney Castle have laid bets on who she'll choose, with young Albert wagering on "Mr. X." After Alyce goes to London to meet a beau (bumping into dancer Jerry Halliday, instead), she is restricted to the castle to curb her scandalous behavior. Albert then summons Jerry to Alyce's aid in order to "protect his investment."

The employees of a failing radio station must put on a huge ratings winner to have any chance of continued operation.

Lewis and Clark, aka The Sunshine Boys, were famous comedians during the vaudeville era, but off-stage they couldn't stand each other and haven't spoken in over 20 years of retirement. Willy Clark's nephew is the producer of a TV variety show that wants to feature a reunion of this classic duo. It is up to him to try to get the Sunshine Boys back together again.

Wanting a break from his overzealous fans, a famous movie star hires a Hawaiian plantation owner to switch places with him for a few weeks.

Three kindly old men decide to light up the dimming twilight of their lives with a last blaze of glory – by sticking up a Manhattan bank in broad daylight.