There is no clear limit of the useful life of a mattress. Industry experts suggest that mattresses should be replaced every 5 to 10 years, but an investigation of mattresses' durability done by Consumer Reports found that 8-year old mattresses still kept their shape and remained firm.
Firm mattresses contribute to a good night's sleep and are very important for those who suffer from back pain. Industry studies have found that replacing an old mattress with a new one helped improve sleep and reduce back pain. Both industry experts and Consumer Reports agree that sagging or lumpy mattresses should be replaced.