And it's not just the shifting of the age, The Mayans knew a lot more than people think, and the COULD predict astroligical events QUITE well. It seems obvious that in addition to the shifting of ages, they could have also predicted the alignment of all the planets with our sun. I think the biggest thing to watch out for is hiccups in the power grid, if anything happens at all. Supposedly there are gonna be some sick nasty solar storms around that time due to the alignment of the plants and the sun, coupled with the fact that the sun is at the peak of a Solar cycle. Blackouts caused by solar storms are a very real thing, and well documented within the last few decades.