What was the significance of a 52 year cycle in both the Aztec and the Mayan calendars?

That was the average lifespan of a Mayan or Aztec individual.

The ritual and agricultural cycles finished together every 52 years.

Mesoamericans used a base-13 instead of base-10 number system.

A Mesoamerican myth said that the sun was reborn every 52 years.

Question

What was the significance of a 52 year cycle in both the Aztec and the Mayan calendars? 
 
That was the average lifespan of a Mayan or Aztec individual.
 
The ritual and agricultural cycles finished together every 52 years.
 
Mesoamericans used a base-13 instead of base-10 number system.
 
A Mesoamerican myth said that the sun was reborn every 52 years.

anonymous · Answer

@Confusionist @Kfins99 Anyone?

confusionist · Answer

A Mesoamerican myth said that the sun was reborn every 52 years was the significance of a 52 year cycle in both the Aztec and the Mayan calendars.

What do you think the answer is based on that?