For this race, people under the age of 35 (including 35) join the young people's group; people from 36 to 50 years old join the middle-aged group and people 51 or over join the elderly group.
这次跑步比赛，三十五岁以下（包括三十五岁）的人参加青年组；三十六岁到五十岁的人参加中年组；五十一岁以上的人参加老年组。