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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".
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