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<p>Mensa will take older SAT scores for acceptance (I know because I used mine). But obviously I took it before 1995. 
I think the reason they won’t take them now isn’t because the test has changed much, but because there is so much more prep going on than there used to be. Back then we wandered in and took it… once. I only knew one person who took it twice, and his parents were college professors AND he was close to a 1600 (perfect back then) and wanted to achieve that goal. Which he did. But we had no prep books, no prep classes, and I don’t think I even knew you could take it twice until I met that one person in college who had.</p>