There have been four distinct ages in human history: the Golden Age, the Silver Age, the Age of Bronze, and the Age of Iron.
The Golden Age was the most ideal. During the reign of Kronus, nature provided abundantly for all needs. The climate was mild, and all evils were sealed away in a cask guarded by Epimetheus, with Pandora not yet created to open it. Humans lived in perpetual youth and happiness, free from toil and sorrow. Death was as peaceful as sleep, after which they became benevolent spirits in heaven.
The Silver Age saw a decline in human quality, both physical and mental. This period began with a helpless infancy lasting a century, followed by a short and troubled adulthood. Humans lived in ignorance and wickedness, ceasing to honor the gods with sacrifices. Yet, as they were not entirely devoid of goodness, they retained some honor and lived on as spirits beneath the earth after death.
The Age of Bronze marked further degeneration. Humans, clad in bronze armor and wielding bronze weapons, dwelled in bronze houses. They were cruel and heartless, reveling in war and perishing in endless conflict. Upon death, they descended into the darkness of the underworld.
The final Age of Iron is one of constant worry and grief. It is devoid of familial love, duty, friendship, hospitality, faith, truth, and justice. Evil is rampant; might makes right; and war scorches the earth. This is a race forsaken by the gods.