Epochs (4)
'epochs' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ages that I've seen before include "Gets older" , "Indefinitely long time" , "Awfully long time" , "(What seems) a very long time" , "Long periods" .)
'epochs' is the definition.
('era' can be a synonym of 'epoch')
This is all the clue.
(Other definitions for eras that I've seen before include "typeface" , "Periods of time" , "Periods, ages" , "At least two times" , "Epochs" .)