Old anti-virus program version with latest virus definition file

[foragersec () yahoo co in]

Could anyone assist me with this? 
I have Old anti-virus program version, but my virus definition file is the latest one. 
I get the definitions updated daily. Now I wanted to know am I still at risk with the above scenario.
As I understand the latest virus definition file would surely protect me with the current risks. Would this be 
sufficient with an older version of the anti-virus program running on my system?

Thanks in Advance,
Regards
foragersec