I don’t see how it’s possible that a school with 5 professors can offer adequate courses for a variety of CS subjects. The frequency would be so low that taking the courses would be a miracle even if they all were offered. I think you would need at least 8-10 professors/lecturers to realistically have a program with any sort of breadth. If there are truly only 4-5 professors, I can’t say I’d recommend going there. Agreed on the age of the Ph.D. overall, but an older greybeard department can be a hindrance if there is not any modern technology taught at all. That can be evaluated by looking at courses of course.
It seems you went from one extreme to the other. There are a lot of schools that are in the middle of CMU and Midwest LAC’s. They are also very different experiences, to the point that finding a student who would enjoy both is relatively remarkable. Why apply to MIT and the like but then look for LAC’s otherwise?