The standard answer is 7–10 years. Like most standard answers, it’s correct in aggregate and not very useful for your specific situation. How long your mattress lasts depends on what it’s made of, how much you weigh, and how well you maintain it — the range runs from 5 years to 15.
By material
Expected lifespan by construction
- Basic polyfoam (budget mattresses): 3–5 years. Polyfoam compresses and doesn’t recover well. If your mattress cost under $400 and is more than 3 years old, it’s probably degraded significantly even if it doesn’t look it.
- Memory foam (mid-range): 6–8 years. Better than polyfoam, but still a closed-cell material that slowly breaks down. Quality varies significantly — higher-density foam lasts longer.
- Hybrid (coils + foam): 8–12 years. The coil system maintains structure long after the comfort layer has softened. You’ll often feel the foam degrade before the coils fail.
- Latex: 12–15 years. Natural latex is the most durable consumer mattress material. It doesn’t compress permanently and resists body impressions better than any foam.
- Traditional innerspring: 6–8 years. Durable structure but minimal comfort layer, which wears out first.
How body weight affects longevity
Weight accelerates foam compression. A 250-lb person will compress a memory foam comfort layer faster than a 150-lb person — it’s straightforward physics. If you’re above 200 lbs and buying a foam mattress, choose one with a higher foam density (5 lb/ft³ or above) and a thicker comfort layer. The “value” memory foam options are built for average weights; at higher weights they wear out faster and the warranty threshold becomes relevant sooner.
Signs your mattress is actually done
The most reliable signal isn’t the mattress — it’s you. If you regularly wake up with lower back stiffness that resolves within an hour of getting up, your mattress has likely lost the support it needs to maintain spinal alignment. If you sleep better in hotels or at other people’s homes than in your own bed, that’s informative. If you can see or feel a body impression when you run your hand across the surface, the foam has compressed past the point of recovery.
Age alone isn’t a reliable indicator. A well-maintained latex mattress at year 10 is often better than a budget foam mattress at year 4. Track how you feel, not how long you’ve owned it.
Making it last longer
Rotate the mattress 180 degrees every 3–6 months (not flip — most modern mattresses aren’t designed to be flipped). Use a quality mattress protector from day one — moisture accelerates foam degradation and any liquid can void your warranty. Make sure the foundation is appropriate. None of these are complicated; they just require doing them.