Answer: Every five (5) to seven (7) years
How long a mattress will last depends on several factors, such as amount of use and original quality, but in general, a mattress set that has been in use 5-7 years is no longer providing you with the best comfort and support. Keep in mind that people’s bodies change over time, and the need for good comfort and support only increases with age. That’s why it’s a good idea to compare the mattress and foundation you are sleeping on now to newer models every few years.
When you consider emerging technologies that continually improve mattress construction and the changing needs of your body over time, you’ll understand why it’s wise to compare the comfort and support of your present mattress to a new mattress at least every few years, regardless of the length of the warranty.