When I parted with mine, Cougar #1 had around 92k I think, and had had wishbones (curiously enough for creaky balljoints rather than knackered bushes), front drop links, new clutch, new alternator, around 14,000 head light bulbs, lots of other stupid little things which just plagued it and was showing very minor rust on the rear wheel arch returns but nowhere else. I bought it 4 years old with 39k on the clock.
Cougar #2 was bought with 90odd on the clock and when I got rid it had about 102k on, with most things original, and all of it completely goosed. It was a wreck, apart from the air conditioning. Front wishbone bushes were hanging out, balljoints rattly and the car was in a real mess cosmetically - rust on the rear wheel arches, and the front wings were completely rotten as well as very dull paintwork and scratches/chips everywhere. The dampers were all completely shot as well. Even the washer pump didn't work - the bottle was full of some white chalky crud which had blocked the gauze protecting the pump! It's the only car I've ever regretted buying to be honest.