Consumed over 50? And the rest! (2,2)
I believe the answer is:
et al
'and the rest' is the definition.
(et al means 'and other people')
'consumed over 50?' is the wordplay.
'consumed' becomes 'ate' (to eat is to consume food).
'over' says the letters should be written backwards.
'50?' becomes 'l' (Roman numeral).
'ate' back-to-front is 'eta'.
'eta'+'l'='ET AL'
(Other definitions for et al that I've seen before include "And the rest (Lat. abbr.)" , "'And others, to the old Romans (2,2)'" , "... and other people (or things) (abbr)" , "And others (abbrev.)" , "along with others" .)