How old is too old, subjective question but I want opinions

I guess I'm less sentimental than the responders so far. I know it's possible to become emotionally involved in a piece of equipment, but why wait until things start to break? Let someone else deal with that. Take the money you'll spend $300-$400 at a time fixing stuff in you old rig and put it into a case of good wine to drink in your new rig.

Sometimes it's hard to define the point of no return. Something breaks, you fix it, now you have more skin in the game so it's easier to justify spending more. Go out on top.