One psychological/cultural basis I've heard as an explaination for shaving is that it gives the appearance that the male is younger than he really is (or, at least, doesn't make him look older than he is).
While it may not be legal, I'm sure there are supervisors out there who see two refs of equal ability but different ages and pick the younger one because he is younger (some also pick the older for the "experienced" look).
Just tossing some psych fodder out there . . .
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