Years (4)
'years' is the definition.
(period of many years)
This is all the clue.
(Other definitions for age that I've seen before include "Just a number" , "Period of history" , "Historical period" , "Very long time" , "Era; grow old" .)
(Other definitions for ago that I've seen before include "In past times" , "Time past" , "(Years) before the present time" , "Previously" , "Gone, past, since" .)
'years' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ages that I've seen before include "Gets older" , "Awfully long time" , "Donkey's years" , "Epochs" , "Indefinitely long time" .)