but this does not matter,for,as he has often remarked,one is never to old to learn然后为什么前后加标点

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but this does not matter,for,as he has often remarked,one is never to old to learn
然后为什么前后加标点

as he has often remarked 看出插入成分,前后用逗号
for因为
全句意思:这并不重要,因为,正如他经常说的,活到老,学到老!

因为

但是这不要紧,因为,正如他经常说,一个人永远不活到老,学到老

但是这不是问题,因为,正如他经常谈论的,活到老学到老。
FOR引导原因从句,前后的标点是为了分割不同的句子,避免歧义,for 是属于one is...这个部分的。