The Sphinx of Giza is probably around 4,500 years old. Because its face resembles that of the Pharaoh Khafre, it is generally agreed by archaeologists that it was built during or shortly after his reign.
Unlike most other Egyptian monuments, the Sphinx was carved from a single mass of limestone exposed when a quarry was dug around it. The quarried rock was used to build the Sphinx Temple, which can be dated to the time of Khafre.
Because of the severe weathering pattern on the Sphinx, there are hypotheses that it is much older, perhaps as old as 7,500 years. However, other researchers have observed that the Sphinx seems to be weathering faster than is normal for limestone for complex reasons, and few archaeologists dispute the 4,500 year age, as of 2014.