From PathfinderWiki
The recorded history of the known world is split into ages, each a distinct and fascinating period of its own. Information from before the Age of Darkness is now all but entirely lost.
Age of Creation
Timeline : Pre-History
Age of Serpents
Timeline : Pre-Humanity
Age of Legend
Timeline : Pre-Earthfall
Age of Darkness
Timeline : −5293 AR to −4294 AR
Age of Anguish
Timeline : −4294 AR to −3470 AR
Age of Destiny
Timeline : −3470 AR to 1 AR
Age of Enthronement
Timeline : 1 AR to 4606 AR
Age of Lost Omens
Timeline : 4606 AR to the present day (Starday, 28 Desnus, 4722 AR)