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Average ht/wt: Average height and weight for a 9 year old by looking at a growth chart would be around 54inches and 62 lbs.But you have to be cautious about these numbers as people's body builds vary and weight may be lighter or heavier. Ideally, one should look at the bmi....Read more.hat is the average weight and height for 9 year old boy? 1. Average ht/wt: Average height and weight for a 9 year old by looking at a growth chart would be around 54inches and 62 lbs. But you have to be cautious about these numbers as people's body builds vary and weight may be lighter or heavier.
The average height of a 10-year-old girl in 1963 was about 55.5 inches; by 2002 the average height of a 10-year-old girl had increased to 56.4 inches. In 1966, the average height of a 15-year-old boy was 67.5 inches or almost 5'7Â½; by 2002 the average height of a 15-year-old boy was 68.4 or almost 5'8 and 1/2.n 1996, the average height of a 15-year-old girl was 63.9 inches; by 2002 the average height of a 15-year-old girl had not changed significantly (63.8 inches). Average Body Mass Index (BMI) for children and teens has increased as well: 1  In 1963, the average BMI for a 7-year-old boy was 15.9; in 2002 it was 17.0.