This is an absolutely fascinating read. An extinct culture, and thus far we are unable to decipher their language and writings, so the best that archeology can offer are educated guesses at their society, based on what evidence they can unearth (no pun intended LOL).
What would it have been like for a child growing up in this civilization? One can only wonder.
It's expressed in our language, our systems, our culture, our religion (Christianity is a religion based in a straight-line concept of time)
But what aobut those people in ancient Sumeria or Old dynasty egypt or the Harappan civilization. 2000 years with things changing so slowly as to be non-visible. This was also somewhat true in the Middle Ages, but still there would be some difference between your grandfathers time and yours in the case of kings and wars
These people would have had a completedly different mindset