1.
middle age, middle-aged
The period of life roughly between 40 and 60, or a person in that age range. Can be used as a noun or as a modifier.
Related Words
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中高年 (middle-aged and older people)
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壮年期 (middle age)
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ミドルエイジ (middle age)
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青年 (young adult, roughly 15-30)
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老年 (elderly, roughly 65+)
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高齢者 (elderly, roughly 65+)
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壮年 (prime of life)