The oldest graves in Ireland yet found are dated to 7,000 BC, about 9,000 years ago, depending on what branch of Druidism you follow, Orthodox, Conservative, Reform, OBD, Druid Network, ADF, AODA, or AOD, we all have slightly different year dates of creation and different Gods, Goddesses and Forces, some such as the Reform Druids put the creation of the Druidism as late as 4,000 BC, which would be year 3000 DY (Druid Year). While the Orthodox Druids put it farther back at 9000 BC, and the Conservative Druids at approximately 8000 BC. It is believed they had a relgion known as Druidism.
Druid Church of America tends to use DY (Druid Year) to take a non-sectarian approach to the other dating related to Orthodox, Conservative, Reform, OBD, Druid Network, ADF, AODA, or AOD, Godesses and Gods, some of which adhere to Fionn, Morrigan, Dis, Brigid, Rhiannon and many others which have different creation dates. We are not dogmatic, we welcome all Celtic Druids here at DCA.