RAM CACHE

Hi, I configured a web acceleration profile with the 600 seconds max age value. when i look at the response from the server ( bigip vs) i see that the cache control max-age value 604800 and also see a age header that is value 495. I confused that which header (age ,cache control) i should consider that is max age value for contents and which is sent by the bigip?

Cache Age: 495 Cache-Control: max-age=604800,public Date:Wed, 04 Jun 2014 06:11:22 GMT

Thanks,