Just like any item that you own, a mattress has its own lifespan. In general, 10 years should be the maximum time before you call it quits and visit your local mattress stores for a new one. The foam and other materials on your mattress may already be deteriorated, compromising its ability to provide a good support for your body.
Your Body and Your Mattress
The only real time that you and your body—joints, muscles and vital organs—get to really rest is during sleep. This is one reason why you have to keep your sleeping pattern in check.
While you lay on any part of your body, the weight of it reduces the flow of blood, this will then signal your brain to send a message for you to roll over. This will restore blood flow to the area but will briefly interrupt your sleep. Ideally, a mattress should be able to reduce the pressure points on your body to give you a good night’s sleep.