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 it is subsequently found that an athlete broke the competition rules then the IOC may strip athletes of their Olympic medals. This has occurred twice in the 100 m: Ben Johnson was awarded gold at the 1988 Seoul Olympics, but was soon disqualified after his post-race drug test was positive for banned substances. The 2000 women's Olympic champion Marion Jones held her medal for a longer period, and was only disqualified seven years later after admitting to doping during that period. Starting with 15 men from eight nations at the inaugural 1896 Olympic 100 m, participation in the event reached