When I was younger (before things started wrinkling and sagging) I made it a point only to get tats on parts of my body that were less likely to wrinkle or sag.
I have armbands (Celtic running dogs and a music score in memory of my father), an entwined fish tat on my inner right knee - story too long to go into - your basic biker rose on my right shoulder and Celtic knot work with a turtle on my lower back.
I love the idea of getting one to celebrate a sobriety milestone. I love the permanence of tattoos.