ram cache

Hi, I configured a virtual server with a web acceleration profile. I set 600 seconds the maximum age value in the profile but when i look at the response from the request i indicate that max-age value is 604800 seconds and Age value is 495. I confused that which value I should consider for caching age value? and how can i see the maximum age value that was sent by bigip?

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

Thanks,