Built 10,000 years ago.
I think the Sphinx is much much oder than the Pyramids.
It was clearly buried in water that cause major erosion along its sides. AND I believe buried and dug up many times before.
The Sides of the area that is dug our around it show water erosion that takes a long time. It was buried up to it’s neck.
Then what remained eroded away to leave what resembled a large rock.
When they built the Pyramids they also carved the face onto what probably used to be a lions head. That is why the face looks so out-of-proportion compared to the body.
So... it was many many many years before they think it was, Eroded by rivers on its sides, buried in muck up to it’s neck, the head eroded, it was re-carved, then dug out long enough ago that the sides of the enclosing box eroded.