I have trouble remembering things from highschool. But my younger sibling, they have vivid memories of stuff from pre-school onwards. And I know they’re not making it up because, well, I was there and was 5 years older.

And many research has shown that long term memory starts forming at, coincidentally, around 4 years of age.

The mind is a wondrous place, and just because you or I can’t imagine it happening doesn’t mean it’s not possible.