The fastest time ever ran by an 11 year old girl was 5:43, by Mackenzie Gray.
I do not know how you prove who has the fastest time. However, in Arcata Califorinia Chloe Pigg ran a 5:39 plus at Humboldt State University on 4/4/09. Six Rivers Running club has the the recorded time. She is 11 years old.
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