The Friday File: Among persons over 69, 10% have a tattoo; 13% of those 51-69 have body art. For those 36-50, 36% have a tat and for persons 18 to 35 it’s 47%. Moreover, the percentage of persons with two or more tattoos rises from 2% for those over 69 to 37% for those 18 to 35. No wonder this industry is growing 7.7%/year and generated $1.6 billion in 2017.