域名年龄
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域名年龄是指某个域名自首次注册以来经历的时间长度。虽然 Google 表示域名年龄不是直接的排名因素，但老域名通常积累了更多的反向链接、内容和信任信号。
示例
A domain registered in 2005 with consistent content and backlinks typically has more authority than one registered last month.