According to FIFA the youngest player in a world cup game was Mario Mendez of Uruguay, who played at the 1954 tournament at the age of 16 years, 1 month and 5 days.
The youngest player in the round of finals was midfielder/striker Norman Whiteside (Northern Ireland vs Yugoslavia 1982) at 17 years 41 days. The youngest player to appear in the final game was Pele (Brazil vs Sweden 1958) at 17 years 249 days.
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Talha Jubair (Bangladesh) is the youngest player to play world cup cricket match. He was 17 years and 70 days in 2003 Cricket World Cup to play for Bangladesh
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Al kaline
Sean courtier age 18
Australia didn't play the finals because they didn't make it past the group phase. In the semi-finals Uruguay lost to Netherlands and Spain beat Germany.