The Chronicles of Aeres began over 20 years ago in high school, with a group of kids playing AD&D 2nd Edition. We started playing games in the Dragonlance universe, but we quickly shifted into making our own campaign setting, one heavily influenced by Tolkien (especially the Silmarillion). It was a monstrous world, with dozens of pages of lore, lots of maps, dungeons… pretty much everything you would expect from fantasy-obsessed teenagers making their own setting. Of course it was all a bit awkward, and the material was filled with confusing characters and tons of inconsistencies, but it was still a lot of fun.
Eventually we moved to 3rd Edition, but the setting stayed the same, and we played nearly every chance we could!