A few months ago I bought a 1997 Camry, which has now done 152,000km (about 95,000 miles).
I decided to have the suspension inspected since I expected it would be fairly worn. Part of the inspection included a shock absorber test, which uses a drive-on machine to test the ground contact rate of each wheel. These were the results:
Front left: 72% Front right: 71%
Rear left: 42% Rear right: 48%
The shop told me that anything above 50% is considered acceptable.
I'm definitely going to replace the rear shocks because they're worn to the point where the ride is "jittery" at highway speeds due to the rear wheels being under damped.
The thing is, they also pointed out that the front right shock is starting to leak. Since the front shocks are still performing well and I don't want to throw money at this car, I think I'll leave them for now. The shop said not to worry about it yet, but the question is, how much longer can I leave it before the leak becomes a problem? I guess it's not something you can really predict?