At what age can a teen get a tattoo without a parent's permission?
If the laws are different in different states, let's say, Connecticut or New York?

To the best of my knowledge the age is 18 in both NJ, Ct & NY.

18 in New York diff states not sure but I do not advise you to get a tattoo until your really sure your going to want it for the rest of your life

...but i do not advise you to get a tattoo until your really sure your going to want it for the rest of your life

Excellent advice! This is a serious thing to consider. So, I would suggest giving it some thought before you do get a tattoo.

18 (I think in all states) ~ make sure only a professional at a reputable shop does it.