This answer depends on how your designing is. Honestly, I don't really know.
It depends on the size of the 11-year old!
ummm. just a little over, but no big deal!
No its actually big
its 1 inch bigger than mine
Yes. You should be happy :)
um im 14 and i have a 8.5 inch but everyone different and it small for a 27 year old
That's the average size for adults!
Yes. The Highest recommend for an adult women is 35".
You are slightly on the small side considering the average is about 6 inches
If you were an adult, you would be average. But, since you are a teen you will still grow, so, yes, you are big.
I was looking for similar info my 10 year old boy does 16 1/2 and people seemed inpressed Michael's Answer --------------------------- I'm 10 and I do 21 inches, so I would say 18 inches, If you train.