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It really depends! Although age can factor in to maturity levels, training capacity, and laws (and other stuff) that are relevent to the running, ones speed and endurance is really determinded throught cardiovascular strength and endurance, muscle strength and endurance, running form, proper nutrtion and hydration, and height (which may help but is not necessary with stride lenghth). Throught common sense a toddler should not run nine miles but someone at age thirteen can easily. my best nine mile is a 54 minute but i am a advance older runner, a long run like nine miles should be slow for LDS training even if your averaging nine minute miles it is still excellent.

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12y ago
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Q: At the age of thirteen what is the average time to run nine miles?
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