Ages
Three ages? Try eight and a half.
First Age
Second Age
The Jek-her'a are created, develop advanced technology, and subsequently kill themselves off with it. Picture a long nuclear winter, entire continents exposed to deadly radioactive energy, and the final remnants of the Jek-her'a breathing their last breath to admit it might have been a mistake to start that war .
Third Age
Sentient life really fucked up Faewalk and the planet wanted some time to itself.
Fourth Age
The current races are born and develop shit. Oh yeah, and there's magic now.
Fifth Age
Things happened. Probably. Faewalk's sentient races opted so hard to never talk about the events of the Fifth Age that it has been lost from memory and the only reason they know it exists is because "five" comes in between "Four" and "Six."
Any artifacts from the Fifth Age are considered a lie and/or propaganda and immediately disposed of.
Sixth Age
The "Problematic Age" (though less problematic than the fifth age because its still talked about. a bit.) where things were incredibly cliched and typically not in a good way. Like High Elves being considered Good and Deep Elves evil. Like, what even is that shit? Fortunatly things got sorted out after they started mingling together more in the seventh age.
Seventh Age
The Unfounded is discovered, marking the beginning of the seventh age.
Eighth Age
The Topsyturvy messes things up. The Steamcog Revolution takes place in The Nest in the nice, even numbered year of 1,000.
Eighth-and-a-Half Age
The current age. The world gets a horrible infestation of Dark Lords.