According to Official Guinness Records,
The youngest player to participate in a competitive darts tournament is Nick Stoekenbroek (b. 11 May 1989) (Netherlands) who at the age of twelve played in the Dutch Open, Veldhoven, Netherlands on 5-7 February 2002.
Stoekenbroek reached the last 128 out of 2,654 competitors.
For a complete list of 2001 records, please visit 2001 Guinness Records in Netherlands.