middle age noun
Learner's definition of MIDDLE AGE
[noncount]
: the period in a person's life from about age 40 to about age 60中年（约40至60岁） -
as our generation approaches middle age当我们这一代人步入中年时
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The patient was in late middle age.这位患者五十好几了。
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He feared the approach of middle age.他害怕步入中年。
— middle-aged
/ˌmɪdl̟ˈeɪʤd/ adjective -
health problems common in middle-aged men and women中年男女普遍存在的健康问题
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a book loved by the young, the old, and the middle-aged [=middle-aged people]老、中、青都喜爱的一本书