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The average 40 yard dash time for a thirteen year old is 4.4 seconds. This is considered excellent performance. The average time for a 13 year old drops to 4.6 seconds after that, which is considered poor. On the other hand, male athletes in the same. What is a good 40 yard dash time for 15- year old at 67 kg and 5'10"? Average is 5.2, good 4.9, excellent 4.6. Anything over 5.5 is not so good. This is from a coach who has timed 100's over 20 years. Your height and weight are good but have no bearing on your 40 time. The forty is important for football and is also a measure of explosive speed. Determine your age-graded score for any running race distance and calculate equivalent times at other distances from 100 meters to 100 miles. ... All distances 15 kilometers and longer are road times, not track times. (For example, we list the road 20K record, not the 20,000 meter track record.) ... Of course, training for a 100 meter dash is.