The HTTP Age response header indicates the time in seconds for which an object was in a proxy cache.
The header value is usually close to zero. If the value is 0, the object was probably fetched from the origin server; otherwise, the value is usually calculated as a difference between the proxy's current date and the Date general header included in the HTTP response.Header type Response header
Age: <delta-seconds><delta-seconds>A non-negative integer that represents the time in seconds for which the object was in a proxy cache.
Age: 24