18 Again!

His mind was 81. His body was 18. When Jack Watson found his fountain of youth, it overflowed with comedy.

Title: 18 Again!
Overview: 18 Again! is a 1988 comedy film starring George Burns and Charlie Schlatter. The plot involves a grandson switching souls with his grandfather by means of an accident. This was one of a series of unrelated films, including Like Father, Like Son and Vice Versa, produced in the late 1980s involving a similar plotline.
Runtime: 1 h 33 min
Release Date: 8 April 1988
Actors: George Burns, Charlie Schlatter, Tony Roberts, Miriam Flynn, Red Buttons, Jennifer Runyon, Pauly Shore, Michael J. Shea, Nancy Fox, Anita Morris, Kimberlin Brown, Tiffany Downey, Connie Gauthier
Certification: PG
Genres: Fantasy, Comedy; IMDb