As you age, the tissue and structure of your breasts begin to change. This is due to differences in your reproductive hormone levels caused by the natural process of aging. As a result of these changes, your breasts begin to lose their firmness and fullness. Also with age comes an increased risk of developing growths in the breast such as fullness of breasts during ovulation,
cysts, and cancer. Keep in mind that women of any age can develop these conditions, however.