I don’t agree with raising the age to get one but maybe say anything above the neck you have to see a psychiatrist first lol if you are insane no tattoo above the neck.
@Eyerollcentral I know you're lol-ing about that but it's actually an interesting question — whether competence and capacity should be assumed for those seeking body-altering procedures, including tattoos but also surgery, fillers, cosmetic dental treatment, etc., or whether there should be some kind of test or assessment.
I have bipolar disorder/The Illness Formerly Known As Manic Depression, and when I'm my normal self I would never dream of getting any kind of tattoo — I'm far too risk-averse and non-committal to want to choose something to display on my body for the rest of my life. But I can quite imagine myself making a very different decision during a manic phase, and indeed people do make decisions like that when they're temporarily but acutely unwell with a psychiatric problem like mania, or when under the influence of mind-altering substances.
Tattoos seem to have some kind of association with other types of mental health problems for some people too — I've seen young women transition smoothly from self-harming via cutting to repeatedly getting new tattoos. If that's a technique they've found to let them love, value and appreciate their bodies instead of attacking them, and they find their tattoos meaningful and helpful, then great, I'm happy for them, but if there's a possibility that this is another form of self-harm for some, then that's more worrying.
I've noticed that those of my acquaintances who need to use secondary mental health services seem to be more likely to have tattoos than people I know from other contexts, but of course it might not be directly mental illness related. There might be socioeconomic factors, or cultural factors, or it might be that sometimes, when you have an enduring mental health problem like schizophrenia, bipolar disorder, or other mental illnesses that either keep coming back or never go away, the whole employment question can seem moot anyway, so it would make sense if people with mental illness are more likely to think, "Screw it, I might as well get that tattoo I want," even if the mental illness doesn't directly influence that decision.
I wouldn't want to ban tattoos for people with mental illness, but I think the question of whether tattooists should have any ethical obligation when it comes to capacity and competence, and how you would regulate or enforce that when tattooists aren't healthcare workers of any kind, is an interesting one.