By Gabe Mirkin, M.D. Recent research shows that three years of taking aspirin daily is associated with a small reduction in heart attacks only in people who have had previous heart attacks, but not in those who had not had a previous heart attack (Clin Cardiol, May 2017). Previous studies have shown similar results (Am J Med, Feb 2015;128(2):137-43). People aged 50 to 70 are more likely to benefit from taking aspirin than those in other age groups. However, daily aspirin increases risk for bleeding in your gut that can cause stomach ulcers or into your brain that can kill you.