The —, 2000 novel by Gore Vidal (6,3)

I believe the answer is:

golden age

(Other definitions for golden age that I've seen before include "Idyllic past time" , "Imaginary idyllic period in the past" , "Innocent time" , "A time of great prosperity - 24 carats?" , "Time when things were at their best" .)

I've seen this clue in The Mirror.

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