I suggest to put age-cap to 24 or less, because of radiation and killers in wasteland, also no tatoo after 1.6k rads, because even skin is glowing and tatoo isnt simple go at skin like water after high rad doses.
Also can be funny if tatoo gonna be scrached after alot fights and description gonna be like this :
*You see Teenager. Her hand covered by letters and scars, you can read Inq<hole with deathclaw tooth inside>t<scar>n .She holding 10mm pistol