<p>i wouldn’t think it matters much in grad school. the age difference between grad students and college students is minimal, and school is not a professional endeavor anyway. the regret/unprofessional perception would come, if at all, once you begin work. but come on, go to the mall and see how many grandmothers and other old people have tattoos. odds are good several people in your future offices will have them. keep it tasteful. keep it above the wrist.</p>