Most of my elementary school teachers were 50+, so by the time I was old enough to be curious about meeting them again, it was too late. Ditto for middle school, but one of them was younger and transferred to my high school the year after I moved up, so I got to know her better. However, I never met her after I graduated. The only teacher whom I had post-graduation contact with was my high school history teacher, who married the daughter of neighbors of ours, with whom my parents were friendly into old age, so I followed his adventurous later life, but we never talked about the old days when I was a student.
Of course, the advent of the Internet allowed me to slake my curiosity about their lives before and after I was a student, and at one point I became obsessed with finding out more about them. For instance, I was surprised to learn that one woman was younger than I realized, and had married a Danish businessman who was a refugee from the Nazis, a backstory I had never imagined for her.
My mother's cousin retired from teaching elementary school at 50, when she married a widowed banker. She still had regular reunions with her former students until her death at 100.