Could the pyramids not have been built by ancient Egyptians?

One point:- Tokyo University attempted to build a replica of the Great Pyramid a quarter the size of the original; they found it impossible.

We, today do not have the technology to align any building as accurately as the ancient builders. The error in the right angles of the Great Pyramid is infinitesimal. But the alignment to the cardinal points is so accurate, that no one today can build that exactly.

As a matter of point, if the Great Pyramid was built in the reign of Khufu, and with the incumbent population, including any forced labour, it could not have been built in his lifetime. Another point to make is that the massive block topping the Kings Chamber is so large in relation to it's position that would take 600 men arranged in ranks to haul it up, what would have to be an almost impossibly wide ramp buttressed against the Pyramid.

And that is only the start.

Ancient egyptian peasants were, so ai have always understood, conscripted to work on the building of the pyramids. There were probably plenty of fit peasant men available for work. Food shortages seem to have been rare in ancient Egypt. And 'average age' does not mean thqt everyone died between 20 and 30. quite a lot of people died as infants, but those who survived fhe perils of infancy to reach adulthood had a reasonably good chance of living into middle age, and some beyond that.

No! The Egyptian people built the pyramids, and we, as fellow humans, should be very proud of that accomplishment, not deny them their legacy by saying it had to be aliens!!

Its the aliens. Don't you have cable?

No the Ancient Egyptians didn't build them, thousands of slaves did, many of which died from exposure or exhaustion.

They had help with Slaves.

Also some people think that they had help with what some call "ancient Aliens"