That's weird to me. I'm in my mid thirties and I feel the bulk of my memories are in the 13-23 range and everything's been a quick blur since then.
In fact when I started a dream diary for a personal experiment, I'm in highschool in most of them - literally, as the dreams take place in the building.
I find this really interesting. I left school 20 years ago, I've lived a wildly varied life and been all around the world on adventures outside of general tourism, with highs and lows tied to locations I am beyond familiar with, yet far too many of my dreams are in that damn school.
I am slightly older and I don't really remember very much from around when I started work after graduating. It's kind of sad that works consume a lot of my time but I have no memory to show for it.
I went through the lucid dreaming rabbit hole when I was 17, I recently found the diary from back then and was curious to see how different the dreams are now.
In fact when I started a dream diary for a personal experiment, I'm in highschool in most of them - literally, as the dreams take place in the building.