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Why age calculators matter

为什么需要年龄计算

Age is required for school enrollment, retirement planning, insurance, medical screenings, and many legal contexts. A simple subtraction is rarely enough because months have different lengths and leap years throw off naive counts.

年龄是入学、退休规划、保险、医疗检查和许多法律场景所必需的信息。简单相减通常不够 —— 月份天数不同，加上闰年，朴素计算很容易出错。