Most box springs last between 8 to 10 years, or roughly the standard mattress lifespan.
While you don’t lie directly on a box spring, the wooden frames can sag, bend, and snap. Similarly, the screws and bolts can loosen and rattle. Some box springs have actual coils and if they break, they can rip through your box spring and harm your mattress. A saggy box spring won’t support your mattress well, either, which can harm your bed.
We recommend simply buying a new box spring or foundation whenever you replace your old mattress and mattress set. Some brands will offer discounts and deals when buying a box spring with the purchase of a mattress.