Rheumatoid arthritis mainly affected age group?

Rheumatoid Arthritis (RA) occurs in every part of the world and across all ethnic groups. According to the Arthritis Foundation, approximately 1.3 million people in the United States have RA - a number that encompasses nearly 1% of the nation's adult population. Almost 70% of people with RA are women. While RA often occurs later in life, it can occur at any age.