Roger Milla (Cameroon, 1994) and Faryd Mondragón (Colombia, 2014) were both named in squads aged 42, and Mondragón became the oldest ever when appearing in the latter competition. His appearance was actually three days after his 43rd birthday. Essam El Hadary (Egypt smashed this record in 2018, playing at the age of 45 years and 161 days.
Brazil has had the youngest player the most times, with five: Carvalho Leite in 1930, Pelé in 1958, Edu in 1966, Marco Antônio in 1970 and Ronaldo in 1994. With Nílton Santos and Djalma Santos the oldest players in 1962 and 1966 respectively, they also have the most "extreme" players overall, with seven. Additionally, Nílton Santos and Djalma Santos, and latterly Edu and Marco Antônio, made them the only team to have had either the oldest or youngest player in consecutive tournaments.
Andrei Bărbulescu was named in the Romania squad in 1960 aged 43, but didn't play. Gábor Király became the oldest ever to play when appearing for Hungary in 2016 aged 40 years and 75 days. This record was broken by Pepe when he appeared for Portugal in 2024 aged 41 years and 113 days.
The youngest player has represented the champions just once: Lothar Matthäus for West Germany in 1980. The oldest player has never represented the champions.
The oldest player has represented the hosts on two occasions: Dino Zoff for Italy in 1980 and Pascal Zuberbühler for Switzerland in 2008. Switzerland also had the youngest player, Eren Derdiyok, in 2008, making this the only time that the youngest player has represented the hosts, and the only time the oldest and youngest player have represented the same team.
Switzerland (with Stiel and Zuberbühler as oldest players and Raphaël Wicky in 1996 and Eren Derdiyok in 2008 as youngest players), Soviet Union/Russia (with Smolnikov, Baidachny and Akinfeev as youngest players and Lev Yashin in 1964 as an oldest player) and West Germany/Germany (with Stielike, Matthäus and Wörns as youngest players and Matthäus also being oldest player in 2000) have all had "extreme" players a record four times.
Bolivia has had the oldest player the most times, with four: Mario Rojas in 1975, Ricardo Fontana in 1989, and Carlos Trucco in 1995 and 1997. Trucco is one of two players to have been the oldest player in consecutive tournaments, the other being Justo Villar of Paraguay in 2015 and at the Copa América Centenario in 2016. These are the only two occasions a team has had the oldest player in consecutive tournaments.
Uruguay has had the youngest player the most times, also with four: Freddy Clavijo in 1979, Juan Ferrari in 1983, Rubén Olivera in 2001 and Cristian Rodríguez in 2004. Clavijo and Ferrari, and latterly Olivera and Rodríguez, make them the only team to have done so in consecutive tournaments.
The youngest player has also represented the champions once: Emilio Mora for Mexico in 1998.
The oldest player has represented the hosts on eight occasions, six of which were for the United States: Fernando Clavijo in 1991 and 1993, Thomas Dooley in 1996 and 1998, Marcus Hahnemann in 2011, and Tim Howard in 2017. The other two were Lars Hirschfeld for Canada in 2015 and Álvaro Saborío for Costa Rica in 2019. The United States's six mean they have had the oldest player the most times. With Clavijo and Dooley, they are the only team to do so consecutively, which they achieved over four successive tournaments. No team has ever had the youngest player in consecutive tournaments.
Another United States player, Juan Agudelo, is the only youngest player to represent the hosts, doing so in 2011. This means the United States also have the most "extreme" players overall, with seven. With Hahnemann, this is also one of only two occasions on which the oldest and youngest player have represented the same team, the other being David Nakhid and Derek King for Trinidad and Tobago in 2000.
Ronaldo (Brazil, 1994 and 1995) is the only player to be the youngest player at a World Cup and a Copa América. No player has ever been the oldest player in both competitions.
No player has ever been the youngest or oldest player at both a World Cup and a CONCACAF Gold Cup.