From the earliest days to the present age, the Points of Light setting have an interesting and compelling history. Take a trip into the past, whether it's to a time before time, or just yesterday.
The ages (and their names) are non-canonical. They are simply periods made up to organize the timeline into a more cohesive story. If desired, you may consider it to be an idiosyncrasy of an NPC historian.
These significant, world-wide events had a major impact on the World and form part of common knowledge through the lands.