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#3 Mexico: 70 appearances
Mexico have been an ever-present side in the World Cup since the 1990s. However, they have also shown remarkable consistency in getting past the group stages only to fall at the next hurdle in the Round of 16.
That means El Tri have played exactly four games in every World Cup since 1994. They somehow never seem to get to the quarter-finals - a round they have reached twice before in 1970 and 1986 (their best ever finish).
Nevertheless, what Mexico have in their squad are players who have played in World Cups before. In fact, 39-year-old Rafael Marquez is the only player in this World Cup who is playing for the fifth time in the tournament.
Captain Andres Guardado is playing for the fourth time at the World Cup. Both players have both received 144 caps for the national team.
Two other centurions in the squad are midfielder Giovani dos Santos and forward Javier 'Chicharito' Hernandez. Other experienced players include goalkeeper Guillermo Ochoa and defender Hector Moreno.
Mexico's average age at the World Cup is 29 years and 132 days - one of the oldest.
