We have a queen size "sleep number" mattress and box spring to give away. You can adjust both sides of the mattress according to how firm/soft you like your mattress. I am not sure how many years old it is. One side of it works fine, the other side sags a bit but when you "pump it up", it is good for a day or two and then it starts to sag again. Please email me if you're interested, thanks.