When I saw that we would be talking about RA in class I started looking into it more. My sister who is only 20, was told by her doctor that she may have RA and they are currently doing further testing. At first I thought "there's no way" shes only 20! But then I did some research and found this article. RA is actually fairly common in young adults, especially women. More specifically, there is a 1 in 714 chance for a woman in her 20s to develop RA. This article goes into more detail about these statistics and the cause.