What is too young for running 50 miles?
MY COMMENT: Honestly? I don't quite know what to think of this. I looked up the results- McKenzie Riford 11:57:06.
McKenzie has also run 2:40 for 800 meters, 5:41 for 1,600 meters and 12:11 for 3,200 meters (she must be 15 now- the JFK Ultra was in 2007)