I guess I'll "revise and extend my remarks." In my mind, I place the roots of modern civilization in Mesopotamia, where we have the earliest evidence of agriculture, which I consider the dawn of civilization. Everything else before that was hunter-gatherer even if the people lived in communities. Caves, huts, teepees, stone homes, I don't care. It wasn't civilization until agriculture, in my estimation.
Arguably, it can be considered to have occurred before then. Maybe it was when language was standardized within a large group of people. Not any good way to date that.