The length of time that a mattress lasts depends on several factors including the original quality of it. Mattresses that are 7 years of age and older are usually in need of replacement.
There are several signs that a new mattress is needed. If the sleeper wakes up to stiffness and numbness, it is time for a new mattress. This is also true if there are visible signs, such as sagging, ripping and staining. Audible signs that the mattress needs to be replaced including groaning and creaking. To ensure the mattress is the best possible for a sleeper, it should be reassessed every few years.