I reported several students for cheating, will anything ever be done by the math dept?
If you're curious how your department dealt with your report, here are some things you can do:


Ask this elderly professor what was done.  Ask him how many proctors he now brings with him to exams.
Observe exams given by this elderly professor at the end of this semester, to see if anything has changed.
Ask your department what they do to prevent cheating.  But first, familiarize yourself with your university's academic integrity policy.


Note that it is not too late to report your observation directly to your department.  Ask them to use a larger room, spread the students out, and bring proctors to the exam, to prevent problems.