field Registered
Verified 2026-09-18 · registry updated
2026-08-28Age
Reports the estimated time a response has been stored in a cache.
Use Age with Date and cache freshness calculations. It is generated by caches, not normally by an origin application.
httpheadercache
Reference (http)
Age: 120
Use Age with Date and cache freshness calculations. It is generated by caches, not normally by an origin application.
Common mistakes
- Treating Age as the time since the origin generated the response.
IANA registry: http-fields/field-names
Registry reference: RFC 9111, Section 5.1: HTTP Caching