the oldest athlete competing at the Beijing Olympics in August is 67-year-old Hiroshi Hoketsu, a dressage rider for the Japanese equestrian team. His first Olympics was in 1964, where he placed 40th in the show jumping competition. It's been 44 years since Hoketsu's Olympic debut, and in that time he's been busy running large pharmaceutical companies, including the Japan division of Johnson & Johnson, prior to his retirement in 2002.
Oscar Swahn at 72 years, nine months from Sweden is the oldest person to participate in the Olympic games. His event was shooting.
The oldest-living human is currently Jamaica's Violet Brown, who is 117.
In 2010, Bill Elliott at the age of 55 was the oldest person to start a Nascar Sprint Cup Series race.
The oldest person in Argentina isn't currently known. Carmelo Flores Laura may have been the oldest person in nearby Bolivia before his death in June 2014. He was speculated to be 124 when he died, but may have only been 107.
The oldest person to ever compete in the Olympics was Robert Tait McKensie of Canada who was 81 years, 64 days old when he competed in Art Competitions at the 1948 Games in London. Art Competitions was a 'sport' that had events of architecture, literature, music, painting, and sculpturing. Medals were awarded based on how the 'work' was inspired by sport.
The oldest Olympic competitor representing Ireland was Joe McMenamin who was 59 years, 319 days old when he competed in three person keelboat sailing at the 1972 Games in Munich ... he finished 16th.