According to multiple sources, approximately 1 in 8 women in the United States will develop invasive breast cancer at some point during their lifetime, which is about 13% . This means that there is a 7 in 8 chance that a woman will never have the disease. The risk of developing breast cancer increases with age, and it mainly occurs in middle-aged and older women. The median age at the time of breast cancer diagnosis is 62. It is important to note that breast cancer can also occur in men, but it is much less common.