Contrary to the beliefs of the makers of “2012”, the Mayans do not have the oldest civilisation on earth! Their civilisation is, at most, 5123 years old, although most people figure that it is closer to 3809 years old, thus making it comparable to all sorts of Near Eastern civlisations, and younger than many, the Pre-Classical Mayans being around the same time as the Minoans and early Mycenaeans in Greece.
And Sumer? The actual oldest civilisation on earth is c. 7000 years old. Yeah. That’s right. Boo-ya for Gilgamesh!