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
Athletics at the 1968 Summer Olympics – Women's 100 metres Athletics at the 1968 Summer Olympics – Women's 100 metres The Women's 100 metres competition at the 1968 Summer Olympics in Mexico City, Mexico. The event was held at the University Olympic Stadium on October 14–15. The race was won by defending champion Wyomia Tyus. She became the first person to defend the championship at 100 metres, a feat later duplicated by Carl Lewis, Gail Devers, Shelly-Ann Fraser and Usain Bolt. Director Bud Greenspan filmed Tyus casually dancing behind her starting blocks before the Olympic final. When interviewed later she said she was doing the "Tighten Up" to stay loose.