Both mine and my Dad's started in our feet when we were 7. Mine was in my toes and eventually spread
to the ankles, knees and hips. Got my upper torso in my 20's. My grandaughter started in her upper torso
when she was 9, now she's popping and crunching at 12. I was about the same age.
My nephew was 2. He collapsed on us when we were walking. He was diagnosed with JRA, was put on
18 baby aspirin and it was 6 months before he could walk again. He's now early 30's. Another nephew
was 16 and showed signs in his legs. My sons were nearly 20 before they were struck with it. I'm
suprised at how heriditary a disease it is.