wait wait wait so I'll tell you that I'm ten, and that's basically all the information you need to know. but.   Average weight for a 10 year old girl 10 Year Old Girl: At the age of ten, the girls will weigh about 70 pounds (32kg) on average. However, since there is a wide range of sizes among kids this age, girls might weigh anything from 53 to 102 pounds and still be considered to be healthy. The height of 10 year old girl can be generally around 54.5 inches.