PC, I did not get my ears pierced til I was in my late late 50s. That does not mean I ever hesitated to hire, train, or promote young people who had piercings just because I did not have mine pierced. Same with tattoos, though I got my first tat a few (4) years sooner than I did my ear piercing thing. I would not worry about it at all if it is in the handbook.
I was not entirely joking earlier about wearing company-image ear jewelry to further break the ice. I think the biggest danger you would face is being seen as a trend setter ... a leader ... if other guys already there who have pierced ears follow your lead.
a.k.a. Mitch E. "Sticky" Gander