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Age-Grading is a way of measuring your running performance taking into account your age and sex....you can effectively score every run you do. Age-Grading is a way of measuring your running performance taking into account your age and gender.
newtesâ¦t3 a 7th grade girl running sub 6 would be VERY fast, not average if you're not in track, i think 7:30-8 is pretty normal if you do nothing athletic whatsoever outside of p.e. then i agree, probably around 9 A: The 50th percentile for running the mile at age 13 is 10:23.