I think you mean Turnabout.
Topper was about ghosts.
What about the movie where the protagonist would have “blackouts” as a kid, which turned out to be his adult self somehow going back in time to try and change some bad things that happened.
As a recall the key theme was one where he was trying to stop the pedo father of his childhood sweetheart from making a movie of them?
The Butterfly Effect. Interesting concept, but would have been a better movie with somebody else besides Ashton Kutcher. It’s hard to take Michael Kelso seriously.
God, is there any more perfect encapsulation of the notion of Hell on Earth? <shudder>
The episode of Quantum Leap where Sam becomes himself, aged 16 or 17.
The TV Series Second Chance (later retitled Boys Will Be Boys] had a loser who goes back in time to help his 17 year old self. The boy was played by Matthew Perry.
In Never Been Kissed, Drew Barrymore’s character goes back to high school to do an undercover story for a newspaper.