How many inches do you consider a big butt based on teens?

I'm 5'4, 31-24-36, and I'm 13 years old.
I don't do any squats because I've heard they tighten your butt, which I don't really like, but my friend who does squats have cute petite apple shaped butt and it fits her well!

I'm just curious because people talk about butts now, lol.
How many inches do you consider a big butt based on teens?
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