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 the entire clue.

(Other definitions for sex that I've seen before include "Male or female" , "Gender" , "VI (Lat.); m. or f." , "Expert in the treatment of coital problems" , "This symbol is epitome of glamour" .)

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