Through the 2008 Games in Beijing, that is Juan Carlos Zabala of Argentina who was 20 years old when he won gold in men's marathon at the 1932 Games in Los Angeles.
Men: Samuel Wanjiru Women: Constantina Diţă-Tomescu
27 Olympic marathons have been contested in the men's division, 8 in the women's division. Performance lists are found at these 2 URLs - http://en.wikipedia.org/wiki/List_of_Olympic_medalists_in_athletics_(men)#Marathon http://en.wikipedia.org/wiki/List_of_Olympic_medalists_in_athletics_(women)#Marathon
Men: Stephan Freigang, GermanyWomen: Lorraine Moller, New Zealand
Men: Lee Bong-Ju, Japan. Women: Valentina Yegorova, Russia.
Yes ... Hwang Yeong-Jo of South Korea won the men's competition and Valentina Yegorova of the Unified Team won the women's competition.
Men: Vanderlei de Lima, Brazil Women: Deena Drossin-Kastor, United States
Richard Weinberger Canada (CAN)
Stephen Kiprotich Uganda (UGA)
No one has won the Olympic marathon more than twice. This feat has been done twice by Abebe Bikila (1960 & 1964) and Waldemar Cierpinski (1976 & 1980)
The 2012 Games in London were Tiki's first Olympics ... she won gold in women's marathon and set an Olympic record.
The last gold medal of the Beijing Olympics went to Samuel Wanjiru (Kenya) for the Men's Marathon