Reported ages, yours and mine (4)
I believe the answer is:
ours
'yours and mine' is the definition.
(belonging to us)
'reported ages' is the wordplay.
'reported' shows a homophone (sound like).
'ages' becomes 'hours' (hour can mean an age or era).
'hours' is a homophone of 'OURS'.
(Other definitions for ours that I've seen before include "Belong to us both" , "Indiscriminate slaughter" , "Yours and mine!" , "British" , "What we share" .)