The Age header contains the time in seconds the object was in a proxy cache.
The Age header is usually close to zero. If it is Age: 0, it was probably fetched from the origin server; otherwise, it was 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 |
|---|---|
| Forbidden header name | no |
Age: <delta-seconds>
A non-negative integer that is time in seconds the object was in a proxy cache.
Age: 24
| Specification |
|---|
| HTTP Caching # field.age |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
Age |
Yes |
12 |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Age