Earlier this month, Olivia Moultrie, a 15-year-old soccer player from California, was granted permission by a federal judge to sign with a National Women’s Soccer League (NWSL) club after ruling that the league can’t enforce its age rule requiring players to be at least 18 to sign a professional contract with one of the league’s clubs.Earlier this month, Olivia Moultrie, a 15-year-old soccer player from California, was granted permission by a federal judge to sign with a National Women’s Soccer League (NWSL) club after ruling that the league can’t enforce its age rule requiring players to be at least 18 to sign a professional contract with one of the league’s clubs.