The relative age effect is a phenomenon in which young born close to a critical age cut-off period may have an advantage in both athletic and academic endeavours. Individuals born at the beginning of the calendar year (e.g. in January) are in fact older than those born at the end of the calendar year (e.g. December). An earlier birth is typically associated with increased physical capacities. Relatively older young athletes are outperformer younger athletes in many key performance measures and they more likely to persevere in sport.
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