Please excuse me for not buying into your knowledge of fact.
See my remarks below.
Not difficult to assume at all.
Only that I've seen quite a few older people sometimes regret earlier, unalterable decisions they made. I believe that as people age the things they find important/significant changes, often dumping old interests along the way. Unlike most such things, tattoos don't lend themselves to such dumping, but rather regret. In fact, my guess is that within 25-30 years of getting a tattoo most do regret it.
Minor correction; I put my remark in the future tense, "years from now. . . ."
It was just a smart aleck, know-it-all generalization; certainly not all who have tats, but in my opinion, a lot of them will.