Anja Dittmer, Germany. Age at the Olympics: 36
Anja Dittmer is one of a handful of athletes who will be participating in her fourth Olympic Games as a triathlete—a right she earned by finished third at the Olympic test event in London last year. And although she’ll be one of the oldest triathletes in London, she holds one of the most lethal, if not the most lethal, finishing sprints in the sport. This puts her in good standing if she’s with the leaders with only a few meters to go.