I am 63. I have had rheumatoid arthritis for 20 years. I am on Cimzia, methotrexate, Plaquenil, Mobic, Protonix, Lyrica, Tizanidine, Linzess. For the past 9 months, I have had exertional dyspnea. 3 weeks ago I had a 6 minute walking test, at the end of which my O2 sat was 79. My workup has been negative except for persistent desats with simple walking in my house and possibly sleep apnea. Today I was told by my family dr that I have early rheumatoid lung and was already scheduled to see my rheumatologist in a week. If this is correct, what is the average life expectancy after diagnosis?