A thousand years ago (1983) I shot a wolf at the San Francisco zoo (and boy were the zookeepers mad!) and to this day, I consider it one of my best ever shots. It's a color negative, probably Kodak Gold 200 IIRC, and I have, in the past few years, taken it out of its sleeve and printed it. The negative has always been treated very carefully and it was processed by a good lab, back in the day. It still prints fine. No fading that I can see. It's been my experience that color negs last just fine if they were processed correctly in the first place. I doubt my own, self-developed color negs will last, assuming everyone's dire predictions of the consequences of using that dreaded blix concoction are true.