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.
There is no limit to how old an Olympic competitor can be. The oldest competitor ever in the Olympics was shooter Oscar Swahn of Sweden who was 72 years, 281 days old when he competed in the 1920 Games in Antwerp. Oscar is also the oldest competitor to ever win an Olympic medal as he won a silver medal in team running target double shot shooting at the 1920 Games. The oldest competitor in the 2008 Summer Games in Beijing was Hiroshi Hoketsu of Japan who was 67 years, 139 days old when he competed in dressage (equestrianism).
Oscar Swahn was 72 years old when he competed in the 1920 Olympic games and he won a silver medal in shooting.
koroipos of elias
The oldest known olympic sport is bull jumping. Source: Chachanswers.com
the oldest track is Wirral ac and is over 100 years first built in 1911.
British equestrian Lorna Johnstone
John Derekson. Motorcycled till he was 62
Henri Paret in 1904. He was 50
Bill Roycroft. Roycroft was 61 years and 131 days old when he competed in individual and team eventing (equestrian) at the 1976 Summer Games in Montreal, winning a bronze medal in the team competition. Obviously, not only is he the oldest Australian to compete in the Olympics but the oldest Australian to win a medal in the Olympics.