Through the 2008 Games in Beijing that would be Greek gymnast Dimitrios Loundras whose Greek team placed second in the parallel bars team event at the 1896 Games in Athens. He was 10 years, 218 days old.
In fact there was an unnamed French boy younger, just seven years:
http://en.wikipedia.org/wiki/Rowing_at_the_1900_Summer_Olympics#Trivia
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HERE IS ALINK THAT GIVES INFO ON THE OLDEST WOMAN AND MAN THAT HAVE WON IN THE Olympics
Who is the oldest man and oldest woman to win an Olympic gold medal?
http://www.funtrivia.com/askft/Question62621.html
How old was the oldest person to win a gold medal in the modern Olympics...what year...what event?http://www.funtrivia.com/askft/Question18948.html