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I do not know for sure, but I am 13 years old in 7th grade, and I am the fastest girl in my gym class (many of them are not motivated that much). I just ran 100 meters today and got 16 seconds. I am starting track this year and our first real practice starts in 2 days, so I'll improve after I start track. But for average 13 year old girls is usually 20, I'd say.

Answerer 2:

A good 100m time for a 13 year old girl would be under 15seconds, but if you're serious about it and want to get in to state/regional, you should aim for at least under 14 seconds.

(I'm 12 and I ran a 14.77 - It's not so great even for my age, I'm aiming to run a lower time- I just started track)

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Wiki User

13y ago

What else can I help you with?