While the battle over body modification typically occurs between parents and their children, state legislatures have entered the conversation as well.

In June, Jerry Garrison, a Florida grandfather, lost custody of his 10-year-old grandson after allowing him to get a tattoo of his initials on his right leg. A “family tradition,” according to Garrison.

Under Florida law, a person younger than 16 years old cannot be tattooed except “for medical or dental reasons,” and anyone age 16 to 18 can be tattooed only with the consent of a parent or guardian.

That law was changed in January 2012; it had previously allowed tattooing under the age of 16 so long as the minor had parental consent.

Most states allow tattoos and body piercings for children under the age of majority, which is 18 years old in most of the United States, with parental consent. Though, some have tightened restrictions.

In Idaho, “No person shall knowingly tattoo, brand or perform body piercing on any minor under the age of fourteen (14) years.”

In South Carolina, anyone under the age of 21 is prohibited from being tattooed. If a person is 18, a parent can give consent, but anyone under 18 is prohibited from ink of any type.

And in Minnesota, it is unlawful for anyone under age 18 to receive a tattoo without written parental consent.

Child development experts contacted by CNN agree with this age of majority for permanent body modification in young adults, but also assert age is but a number; maturity level is a much better parameter to go by.

Psychiatrist Daniel Bober, an assistant clinical professor in the Child Study Center at Yale University, says it helps to look at a child’s functioning in other areas of their life, such as school and peer relationships.

“The brain of a young person is still developing and they are less risk averse, more impulsive, and more likely to engage in risky behaviors,” says Bober.

“This is because the last part of the brain to develop is the part that tells them to ‘put the brakes on’ before they do something potentially harmful and dangerous.”

It’s also permanent, adds Victoria Pitts-Taylor, a professor of sociology at the City University of New York and author of “In the Flesh: the Cultural Politics of Body Modification.”

“Tattoos, for example, have some style credibility because they reflect a willingness to ‘trade in skin.’ They are thus a Catch-22 for young people,” says Pitts-Taylor.

“The aesthetic commitment they require probably extends too far into a young person’s future — how will they know they will be the sort of person to like it when they are 30, 40 or 50? But that risk is exactly what makes them appealing.”

Hillary Kevilus recognizes that aesthetic commitment now, but it was a different story when she got her first tattoo at the age of 15.

“I had just broken up with my boyfriend, ‘the love of my life,’ and it’s a heart with a dagger through it on my right calf. It’s huge and it’s a horrible reminder of a painful childhood and bad teenage decisions,” Kevilus shares on CNN’s Facebook page.

John A. Haynes, however, says those reminders are exactly why he doesn’t regret his decision to get his first tattoo at age 17.

“I don’t regret my tattoos. Each one reminds me of where I was at certain stages off my life, and my mindset. It’s like keeping a scrapbook, only on my body and not collecting dust on a shelf somewhere taking up space,” he says via Facebook.

Piercing ears is socially acceptable in America, especially for girls, in contrast to earlobe stretching or tongue rings, like Smith’s, that are far less common.

In some Spanish and Latino cultures, it’s customary to pierce a baby girl’s ears shortly after they’re born.

“Children’s bodies are especially susceptible to this kind of social policing. We allow them to modify their bodies to some degree so long as they do not step outside the norm; we see it as our jobs to bring them up as social ideals,” she says.

Pitts-Taylor says the double standard ultimately adds to the appeal for minors.

“Children are very good at detecting this kind of hypocrisy.”