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" ... Exactly how old, though, is a matter of debate. No direct samples – as of yet – have been taken from SPA in order to date it using radiogenic analyses, where the decay of radioactive materials act as a sort of chemical clock. It is, however, at least 3.9 billion years old, and the clue’s right there in the name. ... "
" ... In working with carbon isotopes, the researchers also used radiogenic carbon-14 to determine the age of each of the samples. They found "a remarkably long-lived tradition of deposition and possible curation spanning at least 3,500 years, from the Early Bronze Age (c. 1700 BC) to the 17th century AD." The Bronze Age dates are extremely important, as they provide the clearest evidence to date that bog butter burial started as many as 1,500 years earlier than archaeologists previously thought. ... "