从释义，用法，使用环境，形象和影响范围五个维度分析at the age of和by the age of的区别，详细内容如下。
1. 释义区别：
- "At the age of" 表示在某个具体年龄时。
- "By the age of" 表示到达某个年龄之前。
例句：
- He started playing the piano at the age of five. (他五岁开始学钢琴。)
- She learned to ride a bike by the age of ten. (她十岁之前学会了骑自行车。)
2. 用法区别：
- "At the age of" 强调某个具体年龄时发生的事情或达到的阶段。
- "By the age of" 强调在某个年龄之前完成的动作或达到的目标。
例句：
- At the age of eighteen, he moved to a different city for college. (他十八岁时搬到另一个城市上大学。)
- She had published her first book by the age of thirty. (她三十岁之前已经出版了自己的第一本书。)
3. 使用环境区别：
- "At the age of" 可以用来描述任何特定年龄时发生的事情。
- "By the age of" 主要用于表示某个年龄之前完成的目标或达到的状态。
例句：
- He started learning ballet at the age of seven. (他七岁开始学习芭蕾舞。)
- By the age of twenty, she had traveled to over ten countries. (她二十岁之前已经去过十多个国家。)
4. 形象区别：
- "At the age of" 呈现出具体的时间点或特定的年龄段。
- "By the age of" 呈现出一个时间限制或目标完成的状态。
例句：
- At the age of twelve, he won his first swimming competition. (他十二岁时赢得了他的第一场游泳比赛。)
- She wanted to become a doctor by the age of thirty. (她想在三十岁之前成为一名医生。)
5. 影响范围区别：
- "At the age of" 强调具体的时间点，在某个年龄上发生的事情。
- "By the age of" 强调时间范围，指的是在某个年龄之前达到的目标或完成的事情。
例句：
- At the age of twenty-five, he got married and started a family. (二十五岁时，他结婚并组建了一个家庭。)
- She wanted to achieve financial independence by the age of forty. (她希望在四十岁之前实现经济独立。)