Cast of 18 Again!

George Burns plays Jack Watson, a wise and charming 81-year-old man who magically transforms into his 18-year-old grandson, David Watson.

Charlie Schlatter portrays David Watson, a carefree and energetic 18-year-old student who finds himself in his grandfather's 81-year-old body.

Tony Roberts takes on the role of Arnold 'Arnie' Watson, Jack's son and David's father, who is caught in the midst of the grandfather-grandson body switch.

Miriam Flynn portrays Betty Watson, the loving and supportive wife of Jack Watson and the mother of David Watson, who must navigate the sudden changes in her family.

Red Buttons plays Charlie, a close friend of the Watson family who becomes entangled in the hilarious situations that arise from the body swap.

Jennifer Runyon takes on the role of Robin Morrison, David's girlfriend, who is shocked and confused by the sudden transformation of her boyfriend.

Pauly Shore portrays Barrett, a comedic character who adds an extra layer of humor to the film with his quirky personality and interactions.

Michael J. Shea appears as the First Orderly, a hospital staff member who witnesses the unusual body switch phenomenon firsthand.

Nancy Fox plays the Waitress, a minor character who interacts briefly with the main characters in a comedic scene.

Anita Morris portrays Madeline, a character involved in the chaotic events following the body swap, adding to the film's comedic elements.

Kimberlin Brown appears as the Receptionist, a minor character who contributes to the overall setting of the film.

Tiffany Downey plays the role of Principal Dancer-Flapper, adding a touch of nostalgia with a dance scene set in the past.