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' is a reversal indicator.
'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" .)