How long does a memory foam mattress last?

A quality memory foam mattress typically lasts 7 to 10 years, with higher-density foam at the longer end. Lifespan shortens when the foam is low density, when one area carries weight night after night, or when the mattress lacks proper support underneath. Using a slatted or solid base with gaps no wider than a few inches, and rotating the mattress, helps the foam wear evenly and last longer.