What is the average age for a woman to be first diagnosed with breast cancer? Breast cancer mainly occurs in middle-aged and older women. The median age at the time of breast cancer diagnosis is 62. This means half of the women who developed breast cancer are 62 years of age or younger when they are diagnosed. A very small number of women diagnosed with breast cancer are younger than 45.
Who is most at risk of breast cancer? The risk of developing breast cancer increases with age. The condition is most common in women over age 50 who have been through the menopause. About 8 out of 10 cases of breast cancer happen in women over 50.
How common is breast cancer by age? Your risk for breast cancer increases as you age. About 80% of women diagnosed with breast cancer each year are ages 45 or older, and about 43% are ages 65 or above. Consider this: In women ages 40 to 50, there is a one in 69 risk of developing breast cancer. From ages 50 to 60, that risk increases to one in 43.
At what age is breast cancer less likely? Rates of breast cancer are low in women under 40. About 4 percent of women diagnosed with breast cancer in the U.S. are younger than 40 . Rates begin to increase after age 40 and are highest in women over age 70 (see Figure 2.1 below).