Crossword Genius

Census datum (3)

Ross

I think it could be either:

age

sex

'census datum' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for age that I've seen before include "Historic period" , "it improves wine" , "Get older" , "Time in years" , "Era; grow old" .)

I've seen this clue in the LA Times, the Universal, the Newsday and The New York Times.
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