The number one complaint regarding mattresses is body impressions or what is more commonly referred to as sagging. This problem is caused by a mattress that is too thick and fluffy losing it's ability to maintain support of the person on it and thus causing sustained impressions in the bed.

You may be experiencing this in your current mattress even if it's not that old. The reason this happens doesnt have much to do with age as much as it has to do with materials used in the beds. When you tried the bed out on the showroom floor it felt soft, luxurious and enveloping; all things that seemed good at the time. Well, those materials used to make it feel soft and luxurious are also the downfall of the mattress. You see, soft thick foams and upolhstery used in todays thicker plusher (more expensive) mattress are the materials that, with use, take body impressions.
Typically the softer a bed is the less dense the materials used. The less dense the materials the more prone to sagging the mattress is.
If you are experiencing this issue with your current bed then you need to check out a brand new Certified Bodyproof Mattress from The Bed Store.
Certified Bodyproof Mattresses
EcoMemory XLG Line of Beds
PureLatexBliss Mattresses