I can see how a tattoo of some deeply religious symbol or image might be an effective reminder of one's commitment to Christ....
One of the churches I go to has three quite elderly women, all widows, who recently went out and got themselves tattoos. They all got them on their ankles
It's what women do now, incl. women of all ages.
FYI, I saw this report in Huffington Post:
' "...Most of my clients are in the older bracket," Gallo-Kohlas told The Huffington Post. "We see a lot of women in their sixties and seventies getting their first tattoos." Gallo-Kohlas recalls a woman in her sixties who got a tattoo because everyone in the golf clique at her gated community had one. It seemed like the thing to do in order to fit in.'
Many Women Get Tattoos Post 50 ? And Don't Regret It Later huffington post
I don't buy the doing it to 'fit in' aspect, but it's hard to deny it's very widespread now. It used to be almost exclusively a man thing, decades back. Now it's a very womanly thing to do, also. Often getting inked is done in family or faith themes.
My wife and I talked to a young lady with the whole of John 3.16 tattooed on her wrist area; it was her favorite Bible verse and mine also; and I'm sure other conversations have arisen as a result of her willingness to go through with this now very womanly thing to do. (If this makes sense?)