The greatest running prodigy since Mary Decker was Kim Gallagher with national class range from the 400 to the 5000 in high school.
This. Absolutely correct. "At 8, she ran a 5:37 mile, the fastest by a girl that age." http://www.voy.com/87202/4/567.html
And still, unless I missed something, holder of the HSR at 2:00.07.