I'm 23 and have recently been diagnosed with arthritis in my jaw. I'm a musician that plays wind instruments, so it has a huge impact on my job (I'm pretty much unemployed while I go through treatment to aleviate the problem; Thank goodness I have a supportive family). I have yet to be diagnosed with arthritis in any other area of my body, but I would not be suprised if I develop more sooner rather than later.
I also have an extremely rare condition called Tietze Syndrome. In a nutshell, it is chronic inflamation of cartilage. That basically means, that any cartilage in my body that becomes damaged will never heal. Currently the condition affects my ribcage, nose, and quite possibly my jaw (undetermined by a physician, but I'm betting the cartilage problems/inflammation that do exist will not go away). There are only about 2 dozen people in the entire world that have been diagnosed with this disease. There is really no theraputic regimen to help consistantly alleviate the pain on a long term schedule.
I'm currently taking the maximum dosage of Lodine, but it no longer is even 50% effective. Even the straight painkiller that I am taking (Esgic-Plus) has no affect anymore.