Yes, that's right! There are five ages: gold, silver, bronze, heroic, and iron age. I don't know too much about what each of the main specifically, besides that the heroic age was about heroes like Hercules for example.
Dido is lesser known but she is a super important figure in Greek mythology. She is the Queen of Ancient Carthage and she is said to have died for love. She is also known as Elissa or Alyssa and was the founder and first queen of Carthage. Carthage was a Phoenician city-state located in what is now Tunisia. The name Dido may come from the same root as David, which means “beloved.” Another theory is that the name Dido means “the wanderer.”
Nemesis sounds so interesting! And I assume that's where the name "arch nemesis" comes from. Nemesis is responsible for enacting retribution against those who show arrogance towards the gods or others. She is depicted as having a sword and scales in her hands...creepy!