Back in the seventies, there were three gals six feet or taller in my high school, and none of them were teachers!
Nowadays, everywhere I go, there are women towering over me. So, yeah, I'd say things have changed. Back when my Mother was a young woman in the first half of the last century, at 5'8" she was a giant. Now she falls toward the median average height.
I've also noticed that heights seem to fall along state lines too. Back east, I saw a lot fewer women at six feet or taller, but out west, they are not unusual atall. In Colorado, there were lots of women 6'4" or better, and thin as rails too. Women in the NW can be tall, but they tend to be much rounder and hippier. All puns intended.