I've often wondered about this, too. But in my experience, the girls who were really into it and did their offices well stayed active members with leadership roles right up until they graduated. The ones who sort of disappeared after junior year were the ones who weren't really that involved to begin with.
I do, however, think it makes more sense for older members to hold the "bigger" offices just because they have had more experience being members, and I think it helps everyone see holding an office as a privilege and not a pain in the butt.
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