Final answer:
Late pregnancy can slightly increase the risk of breast cancer, but overall risk decreases post-menopause. Hormonal exposure, genetic factors, and family history are significant in assessing an individual's risk of breast cancer.
Step-by-step explanation:
It is false that late pregnancy increases the risk of breast cancer. In fact, pregnancy at a later age can sometimes slightly increase the risk of breast cancer, but once a woman finishes menopause, her risk of breast cancer starts to fall. Breast cancer risk is influenced by the estrogen and progesterone levels and exposure over a lifetime. Pregnancy typically causes an increase in these hormone levels and further development of the mammary tissue. However, family history, genetic factors, and the age of onset are also strong contributors to breast cancer risk. For instance, a family history of breast cancers, with early onset of the disease or incidence of both breast and ovarian cancers within the same individual or family, indicates a higher risk due to potential genetic mutations.