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The average weight for a male 15-year old is roughly 125-140 pounds. The average height for a male 15-year old is 5'7.
For a 15 year old boy of average height (5'9") 150 pounds For a 15 year old girl of average height (5'4.5") 121 pounds
Height - 15 = Weight
9stone
125
150
180kg
150
99 pounds
The average weight would be around 135-145.
Average weight for 15 year old girl height 1.68m active swimmer is around 54 kg
15 kilograms is the average weight for 3 year old boy