Yeah, going back in time is too op. Let’s say you become your 6 year old body with the same memories and mental capacity as you are now. What about now?
I think it is because when you see it for the first time as a kid, it leaves such an impact that whenever you see it again, you feel nostalgic. I personally feel the same when I go through the carpet section and seing all the rolls of carpets hanging on the walls.