I Was Diagnosed With RA 11 Years Ago. Started Out

I was diagnosed with RA 11 years ago. Started out with Enbrel---worked great, but when I reached retirement age Medicare would no longer pay for it. I have been on Remicade, Cimzia, Orencia----all worked for awhile, but I developed side affects to them all. I now get infusions of Rituxan every 6 months. It is helping----my question is , what is the life expectancy of someone with RA ? I know everyone is different---genes, other health problems . age, weight. Can you give me any insight on this?