Question: what is the average height for grade 8?
Answer: Well the average height for a 13 year old 8th grader is 5 foot 6. The average height for a 14 year old 8th grader is 5 foot 9. On average a boy gets a growth spurt at age 14. At 10 years old, boys are 55 inches tall and weigh 68 pounds, on average.