How long should you keep a bed, the matresses before replacing it?

Growing up we had regular beds and would keep them until the matresses became worn and had to be replaced. These days Hubby and I have a waterbed that we've had for about 5 years...we've had to replace the bladder (the thing the holds the water) once since we bought it. I love the waterbed and I sleep much better on it. [b]~~AT PEACE WITHIN~~ **STAND STRONG IN YOUR BELIEFS**[/b]

I did read somewhere that 10 years is the maximum amount of time to keep your bed before it needs replacing. I would desperately love a double bed my friend, but there are two big problems, one my room isn't big enough and two I only plan to live where I am temporarily so I don't want the added cost of moving a double bed to my new home. But I would only buy new, I never fancy sleeping in a bed that has been used by someone else! We spend a lot of time in bed so it needs to be comfortable!

A mattress should be replaced about every 10 years. The reason is that it somewhat conforms to your body and gets weak enough in certain places for your body to sink in a bit. Sometimes you can even see a dent where you normally sleep. That results in problems like back pain, shoulder pain, neck pain, etc. That's because your sleep position is not right. As to which one is best, I have no idea. There are many good ones out there. You should go out there and look at several and lay down for like 15 minutes to try them out. Even if you like one, keep looking at several stores. You might find something better or the one you like cheaper....