## Core Concept
Routine screening mammography is a crucial tool in the early detection of breast cancer. The American Cancer Society and other organizations provide guidelines on the age at which women should start routine screening mammography. The goal is to detect breast cancer at an early stage when it is more treatable.

## Why the Correct Answer is Right
The correct answer, , aligns with recommendations from various health organizations. For instance, the American Cancer Society recommends that women aged 45 to 54 should have a mammogram every year, and those 55 and older should have a mammogram every two years. However, the general consensus and starting point for routine screening is around the age of 40 or 45, but the specific age can vary slightly depending on the guidelines.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is too early for routine screening according to most guidelines.
* **Option B:** - This option might be considered too late for initiating routine screening by some guidelines.
* **Option D:** - This option does not align with any standard recommendation for routine screening.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while guidelines may vary slightly, the general consensus supports starting routine mammography screening around the age of 40 or 45 in women of average risk. High-risk women may need to start earlier.

## Correct Answer: .