Do you get a good night's sleep? When I was younger I could sleep anywhere, but over the past few years that's changed. You know the feeling. You wake up stiff as a board and your hips and shoulders hurt. Doesn't make for a great night's sleep, right?
My wife and I have been sleeping on a king size pillow-top mattress for about 15 years or so and it's getting a bit long in the tooth, as if beds had teeth. Maybe just old is a better way of putting that.