 The senior group races on a 300-yard swim, an 8-mile bike ride and a 2-mile run.The age groups start in heats, with each boys' age groups starting before the girls' age group.The first age group to start are the 14-year-old boys, followed by the 14-year-old girls, and this continues down the age groups to the 6-year old girls, the final group to start.