average mile run time for 14 year old
Rating Newest Oldest. Best Answer: Your time is what the average 14 year old girl does in the mile. Runners World Age Grading Calculator.. To get better run 30-45 minutes in the morning (or when it isn't hot) like 5 days a week.That's not competitive training though.Source(s): http://www.runnersworld.com/cda/agegradi...ating Newest Oldest. Best Answer: Your time is what the average 14 year old girl does in the mile. Runners World Age Grading Calculator.. To get better run 30-45 minutes in the morning (or when it isn't hot) like 5 days a week. That's not competitive training though.