Crossword Genius

Vast age (4)

Ross

I believe the answer is:

aeon

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vast age</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for aeon that I've seen before include "Immeasurably long period of time" , "Longest division of geological time" , "Eternity" , "Vast time period" , "Very long and indefinite period of time" .)

I've seen this clue in The Telegraph and the Sydney Morning Herald.
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