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Years and years (4)

Ross

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5 4*

(Other definitions for aeon that I've seen before include "Longest division of geological time" , "An age; period" , "Vast age" , "Epoch" , "Vast time period" .)

I've seen this clue in The Wall Street Journal, the Universal, the LA Times, the Newsday, the USA Today and The New York Times.
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