名词
中文翻译：有效年龄
同义词：
['effective lifespan', 'effective period', 'effective duration']
例句：
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1. Thecompany has a policy of offering employees a generous retirement plan.
该公司有一个慷慨的退休计划政策。
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2. The project's effective age is set at 5 years.
该项目的有效期限设定为5年。
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3. The new law will have an effective age of 18 years old.
新法律的有效年龄为18岁。