For more than a century, Egyptologists have dated the Great Pyramid to around 2580 BC, about 4,600 years ago. The study, which has not yet been peer-reviewed, examined twelve points around the pyramid's base. Archaeologist have long dated the Great Pyramid to about 4,600 years old. The new study measured erosion at twelve points around the base of the Great Pyramid of Khufu. Despite these variables, the consistent results across twelve measurement points strengthen the claim that the pyramid’s base has endured tens of thousands of years of exposure.