WAG JO Nationals Junior/Senior A vs B vs C?

[blue_5678]

What is the difference between A B and C at JO nationals? In other words how do they decide on these groupings?

You'll have to excuse me if this is a ridiculous question, I'm not American and it was my first year watching/following JO nationals.

 

[Jard.the.gymnast]

It's about age. Junior A is youngest and senior F oldest. The exact ages for each group are on the site of JO nationals

 

[sfts]

As Jard said, groupings are decided by age: http://www.jonationals.com/wp-content/uploads/17agegroupchart.pdf

The age groups vary every year. They were decided by splitting all gymnasts across the country who had qualified for a regional championship meet into roughly equal groups by age.