What was the longest-lasting civilization?

[Still Waters]

Ancient Egypt, China and Mesopotamia are all frequently cited as long-lasting civilizations, enduring for thousands of years. But which of these societies lasted the longest?

It turns out, that's not a straightforward question, for a few reasons. First, modern historians and archaeologists don't agree on a single definition of a civilization, including when one begins and when one ends, and many experts are doubtful whether civilizations can be measured in this way. 

Second, all great civilizations had periods when they were ruled by "foreigners" — the Hyksos in Egypt, for example — which complicates whether they should be considered continuous civilizations.

Continued:

https://www.livescience.com/archaeology/what-was-the-longest-lasting-civilization