I have been a tenured faculty member at a math department in the US for a few years. Recently two colleagues of mine asked (apparently independently) why I do not have PhD students. I honestly explained my reasons to each of them. Also I added that despite that, if it is necessary I CAN take students. Neither of them commented my answer.
Should I take these two questions at face value? Or did the colleagues try to let me know in an indirect way that I am expected to have students? Is there a way to make sure whether my department is unhappy that I have no PhD students?