Last week on social media I encountered a former student of mine from three years ago. I didn't remember him.
I keep PDF's of my grades, and have for about 5 years now. Today I went through the lists of names of students in my classes from the last few years. I can't believe how many of them whose faces I cannot bring to mind, and how many whose names I just don't remember. I've never been very good at names, but this is ridiculous.
I have 12 more years to teach before I can afford to retire. I worry that my mind won't make it that far.