golden age

(noun) a time period when some activity or skill was at its peak. Synonyms: golden age. Example: "It was the golden age of cinema."

(noun) any period (sometimes imaginary) of great peace and prosperity and happiness. Synonyms: golden age.

(noun) (classical mythology) the first and best age of the world, a time of ideal happiness, prosperity, and innocence; by extension, any flourishing and outstanding period. Synonyms: Golden Age.