Tissue lost through piercings isn't regenerated either, I'd argue it has a more permanent effect than a tatoo, and the government also allows other forms of body modification like circumcision which even sometimes results in death, so they really have no credibility putting an age of 18 on tatoos.
I'm actually pro tatoo's, but i really think 18 is the right age, and i think piercings should be moved up in line with this. Until your 18 i really don't think you understand the consequences with regards to employment or the fact you might not want it when your 21.
