So sorry to hear you are in pain. My grandmother and all of her sisters had very bad rheumatoid arthritis, and the memories of my grandmother suffering still haunt me. I'm 34, and for several years now, I've been having symptoms, but I have yet to accept reality and see the doctor about it. For me it seems like the symptoms come and go, and the weather really affects how I feel. Also, when I was pregnant with both of my children, the symptoms seemed to get a lot better, but then after both births, it came back with a vengeance!
Like you, I have worked out all my life. I definitely say keep on working out as much as your body will allow. I think it's really important to keep your body as flexible and strong as possible so that stiffness doesn't set in. I find my whole body gets really stiff if I don't keep up with my routine.
I'm curious to know what your symptoms are, and how long you've been suffering from this? Also, how does your body react to working out now compared to before? You are definitely an inspiration, and please don't give up your workouts.
Dani