Yes, it makes him look ruggedly handsome - in fact, I'm a little startled by how much more attractive he now is
Yes, he owes it to the memory of his retired colleagues, or at least the amusement of his students
No, he owes it to his current colleagues and students to not have to look at that
No, his wife has spoken ("What a PUNK!") and, honestly, hasn't she suffered enough already?