I feel like this too. I remember one time I came across a stack of notes (the throwaway kind I just write to help me learn) from school and I read through them, it made me very nostalgic. Especially reading homework set by teachers who have since died.

It actually did make me tear up a bit.

I even feel nostalgic and tearful looking at random doodles on a piece of paper that I did during my first job many years ago.