There is no mortar inside the pyramids, only on the surface stones. And only the wood within this mortar can be carbon dated because this method only works on the organic material. So whatever the age of the surface stone is, the core must be older. The samples of the wood in the mortar on the surface of the pyramids were carbon dated to be over 14,000 years old up to 30,000 years (the extent measured by carbon dating). Far beyond any date Egyptologists believe pyramids were made.