Cards in pages grading question/opinions

Let's say cards from the 50s have been kept in pages for 30+ years, what do you think the average grade would be? Just a thought on what grades you have received from cards that have been in pages for most of their "life" as opposed to top loaders. My only experience is recently I purchased 2 54 Topps cards that were stored in pages for quite some time. They both graded as PSA 6 and I was pleased/surprised.
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Comments
I had some pages I bought when I was kid in the 80's and the cards that were in them all turned yellow.
1994 Pro Line Live
TheDallasCowboyBackfieldProject
Besides the answers you also received, it would also depend a lot on where/how the cards were stored this 20 plus years.
Also, pages made 30 years ago where made of PVC. So they might be chemical stained/changed from the pages.
Mark
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
Thanks,
David (LD_Ferg)
1985 Topps Football (starting in psa 8) - #9 - started 05/21/06