Boy version of Freaky Friday
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, Vice Versa, and the Italian film Da grande, produced in the late 1980s involving a similar plotline.
Jack Watson (George Burns) is a millionaire playboy who is about to turn 81 just as his grandson David (Charlie Schlatter) is about to turn 18. Jack laments his old age and wishes to get back to his teens once more. When an accident switches their souls, Jack gets to live his grandson's life and all that it entails: school, sports and romance. Unfortunately, David gets the raw end of the deal: as not only is he trapped in his grandfather's 81-year-old body, but he is also in a coma.
Jack gets to approach his family from a fresh point of view and doesn't always like what he sees: he's been a distant parent for his son Arnie (Tony Roberts) and has...