Of or pertaining to a Golden Age (Latin aetas, aetatis 'age', and aureate from aurum 'gold'). As far as I'm aware the word was coined in, and only occurs in, the recent Pulitzer Prize winning novel The Amazing Adventures of Kavalier & Clay by Michael Chabon. Part IV of this is headed "The Golden Age".
During 1941, in the wake of that outburst of gaudy hopefulness, the World's Fair, a sizable portion of the citizens of New York City had the odd experience of feeling for the time in which they were living, at the very moment they were living in it, that strange blend of optimism and nostalgia which is the usual hallmark of the aetataureate delusion.