Fine line tats?

Curious when it comes to the aging of a tattoo. Is it just basic knowledge that fine line work tends to, for lack of a better term, bleed together? I'm noticing on my DH's sleeve his pin up girl is not "aging" well. Couple factors are it's on the lower arm (sun exposure) and it was very fine line detail? That and he's a hairy MF'er. Just curious becuase i want to start a sleeve on my upper outside arm, but feel like making sure it's not too fine line? This would mean enlarging the face, etc? Does this make sense?

It makes absolute sense.