"Old Like Earth or with Holes in her Brain"

My friend Bozena wrote me an update on our high school. The high school that we graduated from in 1976 was celebrating its 60th anniversary. One of the teachers ("professors" as we called them) came looking "as old as earth", the other one "had holes in her brain". Overall impression of the event, as described  by my friend, was fantastically odd. - I didn't attend it personally; I was far away in the safety of my home in the tropics!