I have several tattoos (large, color, in places you would never see them in office clothing) from my early 20s (I'm 44 now). The color has faded somewhat in that it's not as bright as it was 20 years ago, but it's still easily yellow/red/green/etc. vs some weird blur. Linework is less defined, but still clear. The forms are not distorted such that you can't see that it's flowers/birds/etc.
They are more traditional style, so linework with color, not a lot of detail. That helps with the blurring and fading.