age limit

复数：age limits

n.regulation establishing the maximum age for doing something or holding some position

1. There is an age limit of 18 for participating in the competition.
   参加比赛的年龄限制为18岁。
2. The new law sets an age limit of 21 for purchasing alcohol.
   新法律规定购买酒精的年龄限制为21岁。
3. Some organizations have an age limit for volunteers, requiring them to be at least 16 years old.
   一些组织对志愿者设定了年龄限制，要求他们至少要16岁。