What is the most common risk factor for developing atrial fibrillation?

Age is indeed recognized as the most common risk factor for the development of atrial fibrillation. As individuals age, the heart undergoes various structural and electrical changes, which can predispose older adults to abnormal heart rhythms, including atrial fibrillation. The prevalence of atrial fibrillation increases significantly after the age of 65, and many studies have demonstrated a strong correlation between advancing age and the incidence of this condition.

As the heart ages, factors such as fibrosis, dilation of the atria, and vascular changes can contribute to its electrical instability, thus enhancing the risk of atrial fibrillation. Additionally, the presence of comorbidities often associated with aging, such as hypertension, heart failure, and other cardiovascular diseases, further elevates the risk.