RE: First of all, the Chinese civilization is not 5000 years old, that’s Chinese propaganda. it’s somewhere around 3,500 year olds.
What happened 1,500 years before the 3,500 Chinese civilization?
https://www.quora.com/Suggesting-China-often-notes-it-has-5-000-years-of-history-On-what-basis-Is-this-an-internationally-agreed-claim-and-could-the-same-be-said-of-other-places-on-Earth/answer/Jason-Szeftel
This link has a quick explanation.