Please pardon the somewhat rambling post below... lol
Where we live, the vast majority of L6 kids are 10-11 years old. The number of girls who won't turn 10 by the time we have states here is less than 30. A few of the 8-9 year olds are the phenoms. So here to get a "youngest" age group they take the 17-18 youngest kids regardless of age and what ends up happening numbers wise is this:
8 yrs - 0-2 kids
9 yrs - 3-4 kids
10 yrs - 10-12 kids
11 yrs - 2-4 kids
Then in the higher up age groups you have the rest of the older 11s and 12s and then the 13+ group. Here, most of the kids that are still in L6 at 12 & 13 are the lifetime compulsory kids, no offense intended at all, but a lot of those kids have no intention of making the jump to optionals. The scores go down quite a bit as you jump divisions. What would be 8th in the youngest group would be 4th in the middle group and 2nd in the oldest group on a typical day. But really it isn't that the youngest group is so much more talented, it's that the division is pulling so many ages all into the same group AND it's all of the ideal competition ages to boot making it appear to score so much higher.
When you hit States though and these groups start getting broken down to 13 kids in a 2 to 5 month span, you see the youngest groups 7-8s and 9s may have a few super high scorers (the phenoms)... but the 5 groups of 10 year olds and 5 groups of 11 year olds are where the really big scores tend to hit.
This trend seems to hold true for the 7's as well here. At a typical meet the "youngest group" (7-11yrs) often scores the highest but at States it's the older 10s, 11s and young 12s that pack the really big punch, not the 7-9 year olds (except again, for those adorable little phenoms).