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Age, age

  age of discovery
air age
steam age
atomic age
space age, space-age technology
Victorian age
New Age, New Agers

Bronze Age, Early Bronze Age, Late Bronze Age
Dark Ages, Middle Ages
Stone Age, Middle Stone Age
Stone Age humans, Stone Age culture
the Ice Age (Pleistocene, or Glacial, epoch)
Ice Age man, the last ice age, Little Ice Age
Iron Age, Iron Age culture
age of reason

Dark Ages means early Middle Ages, about 476-1000, in European context only.   This term is becoming obsolete.

See also GEOLOGIC TIME.