What is the healthy weight for a girl who is 5'4'' and 14 years old?

105-120 pounds As you age it would be more of 125 - 150 pounds But you also should not stick with average only, because pure average maybe very stupid. Would someone with feet on the oven at 180 and head on the fridge at minus 40 be comfortable just because the average is 70? Consider the structure of your body, picture it by observing your older blood relatives. That will give you an important idea of tendencies; only an idea, what not necessarily means a fate. Healthy attitude is likely to real life. Healthy weight is likely to average.