解释一个句子的语法As is often the case with elder people ,my grandma

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解释一个句子的语法
As is often the case with elder people ,my grandma talked about my new hairstyle for at least 50 minutes nonstop.
为什么是定语从句,麻烦从语法角度解释一下.
判断一个句子是定语从句的标志就是N+从句，但这个句子好像不是，那么怎么样才可以完全判断出定语从句呢。

此处是as引导的非限制性定语从句,其代指整个主句.也就是my grandma talked about my new hairstyle for at least 50 minutes nonstop这句话is often the case with elder people.
意思：我的奶奶（或外婆）谈起我的新发型就滔滔不绝,至少的不停地说上个50分钟.这对于老年人是很平常的事.

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