Humanity is 5 epochs old. We have been around the Mayan Calendar 5 times.
Noah's flood was the end of the last epoch before this one that just ended in 2012.
Archeological dating sucks. Their number have been show to be way off. And it doesn't help that we are probably only about 1000-1250 AD, because people messed with the calendar.
We also do not take into account that there were much more advanced civilizations of humans on the planet. We have reset 4 times.
no doubt our past is quite different to the official story. We simply know too little to be very confident about it.