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For me as well. And I have three grandmothers, courtesy of my stepmother. Two of them died while I was in college, the third is 97 y.o., and I've got two more semesters to go, so there's a chance I may be one of those people who dips into the "negative grandmothers" category.

This is a very good point. Both my grandfathers passed away when I was young (i.e. before I took any important exams), whereas both my grandmothers are still alive and kicking.

There's not really an age when women outnumber men 24:1 though [1]

[1] Figure 2, http://cnx.org/content/m42935/latest/?collection=col11407/la...