How tall are the pyramids, And how old are the pyramids?

Height originally, 481 feet (147m)

Nowadays it's 451 feet (138m)

Archaeologists believe Egypt's large pyramids are the work of the old kingdom society the rose to prominence in the Nile Valle after 3000 BC

Historical analysis tells us that the Egyptians built the Giza pyramids in a span of 85 years between 2589 and 2504 BC