One of the many body switching movies of the 80s, 18 Again! does a pretty routine job at comedy.
The only variable with similar titles is that here the story is observed entirely through only the other party of the body switching process as the 81-year old grandfather overtakes the body of his 18-year old grandson, while the grandson ends up in his unconscious body, hooked to life support. This decision leaves the growth story that’s usually in the core of the movie one sided. Another call I didn’t agree with was using the grandpa’s voiceover throughout the movie, often delivering uninspired one-liners – or explaining the situation to the viewer in a condescending fashion.
One noteworthy piece of trivia to share of 18 Again is that this was the last movie for the ageless comedy legend George Burns who plays the 81-year old grandfather. In reality, he was already 91 at the time.