Age header contains the time in seconds the object
has been in a proxy cache.
Age header is usually close to zero. If it is
Age: 0, it
was probably just fetched from the origin server; otherwise It is usually calculated as
a difference between the proxy's current date and the
header included in the HTTP response.
|Header type||Response header|
|Forbidden header name||no|
A non-negative integer, representing time in seconds the object has been in a proxy cache.
|RFC 7234, section 5.1: Age||Hypertext Transfer Protocol (HTTP/1.1): Caching|
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