The age of your mattress is a poor indicator in determining whether it's time for a new one. Though it is recommended to change every five to seven years, some mattresses will last up to 10 years if properly kept.
The mattress should meet your current needs for space, comfort and support. With age, your body will change and require a superior level of comfort and support than when you were younger. When your mattress starts becoming uncomfortable, this may be a sign that it needs to be replaced. The size of a mattress is also an important factor to take into consideration. The size of a mattress for a child will differ from that of an adult. When the person outgrows the mattress, it's time for a new one.
The quality of your mattress is very important. Like many other household items, a top quality mattress can provide better comfort and support for many years. A poor-quality mattress can deteriorate quicker and therefore will need to be changed sooner.
How often you use your mattress has a significant effect on its life span. A mattress that is used nightly is more likely to last a shorter amount of time. Another factor that could influence the mattress' life span is whether you watch television or read in bed. A guest bedroom mattress will have a longer life cycle. You should replace a mattress that has visible wear and tear. Another sign is that the mattress is saggy or lumpy. Waking up tired and achy is a good indication that your mattress is worn out.
Taking proper care of your mattress increases its life cycle. Using an appropriate protective pad to keep it free from stains is always a good idea. Children should not be using the mattress as a trampoline. A good way to care for your mattress is to rotate it. A single-sided mattress should be rotated from end-to-end (180 degrees). A double-sided mattress should be rotated as well, and then turned over so the foot of the mattress is now at the head. For a new mattress, you should rotate it every two weeks for the first three months, then once every two months afterward.