Garry Kasparov .
The world's youngest grandma is Rifca Stanescu from Romania who became a grandmother at the age of 23 when her daughter gave birth at the age of 11.
The youngest f.I.f.A player is 22 year old Lionel Messi.
Harry Potter himself became the youngest player in a century when he joined the Gryffindor quidditch team as Seeker in his first year.
No Pele is not the youngest, but he is the youngest to win a world cup at 17 years.
The 17-year old Feller became the youngest player ever to play a regular season game.
1896
Mild-mannered nine-year-old maths machine Oscar, who became the youngest person ever to get an A* in GCSE Maths aged seven
I have a feeling its Muhammad Ali. He is world famous.
the youngest ringmaster in the world is chase garden of garden bros circus
I think it is Lionel Messi and christiano ronaldo.
My girlfriend had it when she was 7 and she was the youngest person in the world to get it my cousin sister is being treated for it since she was a year old
Theo Epstein in the year 2002 became the Red Sox general manager at the age of 28.