It is inevitable that you will one day have to replace your old mattress. The quality of the old one will determine the length of time it lasts. Will you require complete full size mattress sets? As you get older, you may find that you require more room in the bed to sleep. Many people like to stretch out completely while sleeping. This can cause problems if both people that share the sleeping space do this.
When should you replace your old mattress with a fill size mattress set? Several things can be checked to see if it is time to replace the one. If it is of poor quality then it will not last as long as a top quality one. If you happen to sleep in one particular spot of the mattress, you will see a definite wear pattern. If this is the case, you can simply flip it over and get several more years use out of it. Remember, you get what you pay for. Therefore, it you skimped and bought a bargain one, it will not last you a very long time.
How often is the mattress used? Obviously, it will last much longer if it is not used very often, like perhaps in a guest room. A child's mattress will not last too long for several reasons. One being the child will outgrow it. Another is if the youngster uses it as a trampoline! That will wear it out much quicker than normal usage. You will likely not require this for a child's room for quite some time.
How you care for your mattress will also determine whether it needs replacing sooner rather than later. A new mattress will need to be flipped every few weeks or so for the first few months. Then it should be turned every few months, this helps the mattress receive equal wear on all areas. This includes full size mattress sets as well. Every size should be treated the same.
Another factor in the life of a mattress is the weight of the people sleeping on it. The more weight on the mattress the more wear and tear it will receive. As mentioned before, as we get older our body changes and we may find that new ones are necessary before the old one has worn out. If it is in your budget, then you should re-evaluate your current mattress on a yearly basis.
Lastly, before purchasing full size mattress sets, you should do a rest test first. Try it before you buy it. Bed retailers allow their customers to test out their stock in the store before buying. Lie down and see how it feels! Not for a couple of minutes, test it for fifteen or twenty minutes to get a real good feel for it. Then you can make an informed decision on your purchase.