The term Golden Age comes from Greek mythology, particularly the Works and Days of Hesiod, and is part of the description of temporal decline of the state of peoples through five Ages, Gold being the first and the one during which the Golden Race of humanity (Greek: χρύσεον γένος chrýseon génos) lived. Those living in the first Age were ruled by Kronos, after the finish of the first age was the Silver, then the Bronze, after this the Heroic age, with the fifth and current age being Iron.
By extension "Golden Age" denotes a period of primordial peace, harmony, stability, and prosperity. During this age peace and harmony prevailed, people did not have to work to feed themselves, for the earth provided food in abundance. They lived to a very old age with a youthful appearance, eventually dying peacefully, with spirits living on as "guardians". Plato in Cratylus (397 e) recounts the golden race of humans who came first. He clarifies that Hesiod did not mean literally made of gold, but good and noble.
There are analogous concepts in the religious and philosophical traditions of the South Asian subcontinent. For example, the Vedic or ancient Hindu culture saw history as cyclical, composed of yugas with alternating Dark and Golden Ages. The Kali yuga (Iron Age), Dwapara yuga (Bronze Age), Treta yuga (Silver Age) and Satya yuga (Golden Age) correspond to the four Greek ages. Similar beliefs occur in the ancient Middle East and throughout the ancient world, as well.