The problem in this study is the still low hemoglobin level in Rajawali Fc soccer athlete caused by several. The index of body mass, genes, physical activity is one of the factors that influence hemoglobin. purpose of this study was to determine the relationship of age with hemoglobin.This research is a quantitative approach with correlational design. The sample in this study was a Rajawali Fc athlete, amounting to 16 people with various ages. Based on the results of data analysis, the value of t count = 1.384
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