A new study found that three out of every 10 American adults, age 18 to 69, have a tattoo. A quarter of those surveyed have several pictures, and a fifth of respondents said they’d considered getting one. Still, some people may be unsure if they should get a tattoo. The research also found that 19 percent of respondents were undecided about getting a tattoo. And a staggering 39 percent of Americans are not yet tattooed.