I've got quite the bad back and am only 32. My MRI showed I only have a couple good lower discs from degenerative disc disease (which everyone pretty much gets eventually). The doctor suggestly highly against surgery. I was given the back saver manual/pamplet by the docs at least 3 or 4 times, but never took the time to do the exercises. This past summer I found out that one of my legs was shorter by almost half and inch and that was making my back pain a lot worse. I got a shoe lift insert and that worked pretty good. What has made my back improve ten fold though is actually doing stretches and exercises. My wife got a Wii Fit video game system this past Fall and has me doing the yoga stretches and twists and all that stuff. Since then, knock on wood, my back has never felt better than it has in the past 4 years.
I suggest first that you check your legs. Everyone typically has one leg that is slightly longer than the other, but if the difference is large enough, it really can affect your posture, back, etc. Next, start doing back exercises and work outs. If you know someone who has the Wii Fit, give it a go. Otherwise, you may want to try scheduling a couple weeks of therapy somewhere to see how that works out for you. It is amazing how my back is not sore all the time like it used to be.
My back pain was steady and when it went out (about every 3-4 months with differing severities) I never found a pain killer that worked. Percocets was like candy and had about an hour long effect as I have a high tolerance to pain meds and the pain was so pulsating, nothing worked. I fought tooth and nail doing the back exercises and stretches, but now I realize I just made things harder on myself. Seriously give that a go for a couple months or more. If you see improvement, just keep it up. Fusing the discs is a drastic step that basically is 50/50. For a few, it has worked wonders, but it has not worked for just as many others. Your back will never be the same once it is done.
I've actually been able to metal detect pain free and without throwing my back out since this past Fall. Definitely try proper stretching and back exercises for a couple months before you decide on surgery. Good luck!