evidence: Breast Cancer Facts & Stats 1 in 8 women in the United States will be diagnosed with breast cancer in her lifetime. In 2024, an estimated 310,720 women and 2,800 men will be diagnosed with invasive breast cancer. Chances are, you know at least one person who has been personally affected by breast cancer. [...] Breast cancer statistics by age [...] - The average age of U.S. women diagnosed with breast cancer is 62 years old.1 - Half of U.S. women who develop breast cancer are 62 years of age or younger when they are diagnosed.1 - About 9% of all new breast cancer cases in the U.S. are diagnosed in women younger than 45 years old.5 - Younger people, particularly those under age 35 at the time of their original breast cancer diagnosis, face a higher risk of breast cancer recurrence.6