iron age

Short definition from Wiktionary

Proper noun

1. 1
   Alternative letter-case form of Iron Age.
2. 2
   The most recent and debased of the four or five classical Ages of Man; hence, any period characterized by wicked behavior.
3. 3
   An age characterized by the use of iron.
4. 4
   A level of culture in which humans used iron and the technology of ironworking. (Estimated to have begun in Europe about 1100 BC)