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by LoganDark 815 days ago
I wouldn't say the brain has no checkpoints. Certain events (like concussions or stroke) can knock out memories or habits and result in roughly what was some months or years ago. Also, certain things like Dissociative Identity Disorder can result in past/younger versions of yourself splitting off and halting development for years or more. Then they can come back up later.

With that said, I don't think anyone really has control over this. I'm a DID system and I have some sort of limited control but my time skips are usually on the order of days or weeks, not years.