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In some sports, peak-performance age for male athletes and female athletes are siginificantly different. In gymnastics, average age of olympians is 4.5 years older in men's games than in women's games. In soccer, female athletes are 3.9 years older on average than male athletes. This may be because some country sends there U-22 team to the Olympics. Source data is all the athletes from 12 medal leader countries at 2012 London games, web-scraped from www.sports-reference.com.