Report ancient harassment to the university?
Honestly, I think this is way over the top. I am not even sure if there is anything that could be reported at all.

Let me just sum it up:


This way 30 years ago, nobody except you might remember your case anymore
Its unclear whether you have experienced harassment at all, it's even harder to tell after 30 years. Hurt feelings do not automatically mean that you were harassed.
You did not take immediate actions back then, as you said, you "got over this"
A friend has told you that he retaliated that she did not want to go on a coffee with him. I have heard way too many stories about (female) students who interpreted way too much into their professors'/teachers' behavior. I would be very cautious with stories heard second-hand. If your friend is really sure that something went wrong, she has to address this issue.


If your report this professor: Which reactions do you expect by the university? Is there anything that they could do now? On the other hand: Are you aware that you could bring him into serious trouble, perhaps just due to a misunderstanding 30 years ago?


  For the record, this is not about me. I pretty much got over this a
  long time ago. My concern is for young women in his classes today.


I think today's women are confident enough to oppose against harassment on their own. Our society is way more sensitive now.