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It's a cost benefit question and depends partly on the role the car is serving for you as well as your goals.
A better way to put is... "Will I notice and improvement in the ride and handling..... ?"
In my experience, absolutely you will notice it. I personally think it's never a dumb idea to change struts and springs after 40-50k. Makes the car feel new again. After 65k, I'd say "definitely do it".
bright-
Thanks for the reply ; the car is my daily driver, and after last inspection in the garage they told me that the rubber mounts of the front suspension were starting to show signs of wear and will probably need a replacement in a more or less close future. The thing is, since they will need to drop the front suspension to replace them, I wondered if it would not be a good opportunity to have new shocks on all four corners since they will have to perform alignment etc. afterwards anyway.
However, the bill will start to rise pretty quicky with shocks+strut bearings+front suspension rubber mounts (and if the front is showing signs of wear, what about the rear? etc. etc.) and I am afraid of the thinking approach of "while I am here..." haha
paulbiche
Is it a dumb idea to change shocks (and strut bearings etc.) on an old car (29yo) but that has low mileage (~65,000 km)? I know shocks are typically more defined with a life span in kilometers/miles and not by an age which is why I wondered if it was still worth a change