Atrial fibrillation in women ranged from 6.6 per 100,000 people per year for patients between the ages of 15 and 44 to 1,203.7 per 100,000 people per year for patients age 85 and older.
Roger V, Go A, Lloyd-Jones D, Benjamin E, et al. Heart Disease and Stroke Statistics–2012 Update. Circ. 2012; 125(1): e2-e220. http://circ.ahajournals.org/content/125/1/e2