http-stats:
HTTP/1.1 Age header field

Common Age header values:

Age: 0
Age: 35
Age: 39
Age: 40
Age: 108
Age: 121
Age: 239
Age: 253
Age: 254
Age: 277
Age: 281
Age: 2011
Age: 3962
Age: 29518
Age: 36215
Age: 156242
Age: 183217
Age: 185279
Age: 724164
Age: 984049
Age: 5774990
Age: 6267766
Age: 7227570
Age: 10714200
Age: 12737922
Age: 13203938
Age: 18071023
Age: 18904767

Sample Age web server response:

HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Content-Length: 2217
Age: 0
Date: Fri, 30 Jul 2010 17:04:39 +0000

<!DOCTYPE html PUBLIC "-//W3C//DTD ...
...
...

Other common HTTP headers

Other less common headers