Final answer:
The leading cause of death from breast cancer in women is not explicitly stated in the age ranges provided. It is implied that breast cancer risk and death rates increase with age, particularly in women over 40. Screening and early detection through mammograms, especially recommended after 50, are crucial for improving breast cancer outcomes.
Step-by-step explanation:
The age range in which breast cancer is the leading cause of death in women is not explicitly stated in the provided references. However, considering that routine screening mammograms are typically recommended for women aged 50 and older, and that the risks associated with breast cancer increase with age, it is reasonable to deduce that breast cancer might be a leading cause of death in the age ranges beyond 40 years old. While we don't have a direct statistic linking breast cancer to a specific age range as the leading cause of death, the data imply that the older demographics are at higher risk.
Overall, cancer death rates have been declining due to better diagnostics and treatments. Furthermore, the fact that worldwide, cervical cancer is the second most common type of cancer after breast cancer, indicates the significance of cancer screenings. Implementing these screenings is crucial for early detection and treatment to improve survival rates.