1
in [noun]
常用作时间状语，表示‘在…时期’。
Many people start experiencing health issues in middle age.
许多人在中年时期开始出现健康问题。
中年
先理解核心含义，再看它在真实句子里的用法。
中年
The period of life between youth and old age, roughly ages 45–65; midlife.
Many people start experiencing health issues in middle age.
许多人在中年时期开始出现健康问题。
老年之前的生命阶段,通常约为45至65岁；中年
The period of life directly preceding old age, often defined roughly as ages 45–65; midlife.
Many people begin to experience health issues in middle age.
许多人在中年开始遇到健康问题。
She decided to go back to college during middle age.
她决定在中年时重返大学。
Financial planning for middle age is crucial for a comfortable retirement.
为中年做财务规划对于舒适的退休生活至关重要。
常用作时间状语，表示‘在…时期’。
Many people start experiencing health issues in middle age.
许多人在中年时期开始出现健康问题。
表示进入某阶段，动词常用 reach 或 enter。
He reached middle age and decided to change careers.
他到了中年，决定换职业。
强调整个期间，与 in 相近但略有侧重。
During middle age, it is important to maintain a healthy diet.
在中年期间，保持健康的饮食习惯很重要。
Not this
He is a middle age man.
Use this
He is a middle-aged man.
中文中“中年”可以直接修饰名词，但在英语中，用作定语时必须使用复合形容词“middle-aged”，而非名词短语“middle age”。
Not this
He is in his middle ages.
Use this
He is in middle age.
中文“中年”可以泛指一段时期，但英语中“middle age”是不可数名词，不能加复数后缀“-s”。
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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.