a golden age
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A period of or defined by outstanding excellence, quality, prosperity, or achievement. This Halloween, we're having a marathon of all the monster movies from the golden age of cinema. Many people look back on the 1950s as some kind of golden age, completely ignoring or denying many of the deep-rooted social injustices that typified that time in America.
a golden agea period in the past when things were at their best, happiest, or most successful.
According to Greek and Roman mythology, the Golden Age was the earliest and best age of the world, when human beings lived in a state of perfect happiness. The Ages of Silver, Brass, and Iron represented successive stages of a descent into barbarism and misery.