My mattress was only 3 years old but apparently it was not the correct mattress for me. I use to wake up every morning with my shoulders and arms aching and was trying all different things to see if it would help the situation, never thought it was the mattress until I tried the Beautyrest  plush Euro top mattress. The pain is now manageable and I actually sleep through the night which was not always the case before.  I think the AirCool® Foam makes the difference to my okay sleep I was getting before to the good sleep I am getting now. I will definitely be telling my friends about this as a good night sleep helps you have a more enjoyable and productive day!