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The Silver era or age can be explained this way. Atlantis (golden age) has just fallen. The survivors have landed, scattered across the world. They don't have the technology or maybe even raw goods to bring Atlantis back but compared to the primitives they are now living among they are like gods.
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So they band together and create the great civilizations Greece and Rome and conquer the world with new technology and strategies, but it is nothing like what the power of Atlantis could have done if they wanted to. But sadly, those days are gone.
The old Atlantians (or those with the knowledge) are known as demi-gods throughout history and their works are told, but only from a person with no knowledge of how they were able to accomplish what they did.
Disclaimer: We don't believe in Atlantis but this gives you a great idea of Gold vs Silver Eras.