What is the average 10 yard dash time for a 13 year old boy with football experience?

A 10 yard dash time is really not a good judge of your speed, the distance is too short. A 40 yard dash is what you need to get a good estimate of your abilities. but I'll give you time for both

40 yard dash-between 5-5.8 seconds

10 yard dash-between 1.3-1.5 seconds