100 metres at the Olympics 40 in 2000 and reached the Olympic semi-finals four years later. (Ottey is also the most frequent participant having competed in the Olympic 100 m an unrivalled six times from 1984 to 2004). The first women's champion, Betty Robinson in 1928, remains the youngest gold medallist for the event at 16 years old, while a 32-year-old Linford Christie became the oldest 100 m Olympic champion in 1992. Since introduction of testing by the IAAF in the early-20th century, female sprinters may be subject to gender verification. This rule was first formally applied to the 100 m at the 1968 Mexico
100 metres at the Olympics African-American and Jamaican women have won the great majority of 100 m medals. Dominance in the men's event has been particularly pronounced from 1984 to 2016, during which time all the men's Olympic 100 m finalists have been of African heritage. Most commentators attribute this statistical discrepancy to genetic rather than to cultural factors. All athletes who participate in the Olympic 100 m competition are subject to the World Anti-Doping Code –the IAAF and International Olympic Committee (IOC) are both signatories. Mandatory in-competition drug testing was introduced at the 1968 Summer Olympics. One of the most prominent cases of doping