大卫的爷爷在过81岁生日时许下了一个心愿，愿自己能重返18岁。一次，爷孙俩在车上嬉戏出了车祸，结果爷孙俩的年龄互换了，老人成了大卫，并到大学里重新体验了年轻人的生活。
George Burns
Jack Watson / David Watson
Charlie Schlatter
David Watson / Jack Watson
Tony Roberts
Arnold 'Arnie' Watson
Miriam Flynn
Betty Watson
Red Buttons
Charlie
Jennifer Runyon
Robin Morrison
Pauly Shore
Barrett
Michael J. Shea
First Orderly
Nancy Fox
Waitress
Anita Morris
Madeline
Kimberlin Brown
Receptionist
Tiffany Downey
Principal Dancer-Flapper
Connie Gauthier
Artist's Model
Darren Powell
Frat Member
