Thanks for the query.
"Lil Poison" (USA, aka Victor De Leon III) was born on 6 May 1998 and is the youngest professional video gamer. He entered his first competition at the age of four.
Source - http://www.guinnessworldrecords.com/world-records/youngest-person-to-be-a-professional-video-gamer
In September 2013 Kurt Steiner in Pennsylvania set the world record, according to the Guinness Book of Records, for what?