// http header · caching header
Age
Seconds the object has been in a proxy cache
What the Age header does
Age is how many seconds a response has been sitting in a proxy/CDN cache. Combined with max-age, it tells the client how much freshness is left before the cached copy must be revalidated.
Example
Age: 24Where it's used
Age is a caching header. Caching headers control how browsers and proxies store and reuse responses.