Definition of golden age noun from the Oxford Advanced Learner's Dictionary

 

golden age

 noun
noun
BrE
 
; NAmE
 
 
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[usually singular] golden age (of something) a period during which something is very successful, especially in the past the golden age of cinema Word Origin mid 16th cent.: the Greek and Roman poets' name for the first period of history, when it was believed that the human race lived in an ideal state.
See the Oxford Advanced American Dictionary entry: golden age