If you’re a woman 40 years old or over, the American Cancer Society (ACS) recommends you should get a mammogram every year to check for abnormalities or lumps that may indicate early stages of breast cancer. Mammograms can see cancerous lesions earlier than you can feel them with a self-exam. Other ways to reduce your risk of breast cancer, include:

"Less than two months after the U.S. Preventive Services Task Force (USPSTF) set off a national controversy with its revised recommendations for mammography screening, the American College of Radiology (ACR) and the Society of Breast Imaging (SBI) have issued recommendations calling for breast cancer screening to begin at age 40 and even earlier for high-risk patients." (source:  Healthimaging.com)

Click Here for the full article and recommendations on why annual Mammograms starting at 40 are advisable.