Golden, Silver, Bronze, Modern, etc.

With my short experience with buying and looking around at CGC graded comics, it seems with older comics that CGC is a little more lenient with their grading. An example would be a silver age comic with off-white pages and corners that aren't fully crisp and sharp graded a 9.8, whereas a modern comic without white pages and sharp corners almost never seems to have a 9.8 grading. Am I the only one that has noticed this? Is it because they allow for a little more aging of the comics or does anyone know the reasoning behind it?

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