the youngest person to complete the london marathon was Ryder Hussey a 13 year old boy from Wales...
It took Greg Billingham just over 7 days to complete the 2007 London marathon and 8 full days to complete the 2008 London marathon. He is the first person in the World to ever run a marathon in slow motion and really is the slowest runner in the World,
The person who won the London Marathon 2009 was Samuel Wanjiru.
well I didthe 1988 milenium marathon when I was 15
The person who won the London Marathon 2009 is Sarah Thompson
The youngest I know of is a kid named Budhia Singh. He is four years old, from India
3.5 year old Budhiya Singh from India
"Buster" Martin @ 101 years old
Not sure if she's the complete youngest, but Danna Paola plays Elphaba in Mexico City. She is currently 18 years of age.
The youngest person would constantly be changing as it would be the newest born person.
The current (as of 7 January 2010) world record holders are:Men'sHaile Gebrselassie (Ethiopia) - 2:03:59 (Berlin Marathon, 28 September 2008)Women'sPauls Radcliffe (United Kingdom) - 2:15:25 (London Marathon, 13 April 2003)