I think it is the German Thomas Mueller. Who is 20 years old.
Christian Eriksen (Denmark)
Christian Eriksen of Denmark is the youngest player in the 2010 FIFA World Cup. He was born on 14 February 1992 (aged 18).
Aguereo-argentina
thomas muller
thomas muller of germany
It could be A. Gyan.
I don't think that there was really a youngest player in the World Cup history, but there was a youngest captain which was Fuad Amin of Saudi Arabia. I
Pele is the youngest to me as he was only 17 years , at his first world cup.
There was no F.I.F.A world cup in 2011.
Shinji Ono
Cristen Eriksen - Denmark 18 years old
pele