p style="margin: 0px; text-align: justify;">An average innerspring mattress lasts about 5.5 years. The coil gauge will impact the longevity of an innerspring bed. Low-gauge wire and tempered steel coils last longer than high-gauge wire and coils made of non-tempered steel. Pocketed coil support cores provide the best contour, but don’t last as long as bonnell and offset coils.</p