Breast screening frequency depends on factors like age, risk level, and national guidelines. For women at average risk:

• Many experts recommend starting yearly mammograms at age 40, but some suggest starting at 40 and then screening every other year, balancing benefits and risks.
• The U.S. Preventive Services Task Force (USPSTF) recommends mammograms every two years for women aged 40 to 74.
• The American Cancer Society suggests annual screening for ages 45 to 54, then every 1-2 years for women 55 and older.
• In Canada, screening is often recommended every 2 years for women aged 40 to 74.
• The NHS in the UK invites women aged 50 to 71 for breast screening every 3 years.
• Women with high risk (e.g., gene mutations) may need earlier and more frequent screening, such as annual mammograms and MRI starting around age 30.

It’s important for women to consult with healthcare providers to tailor screening schedules based on personal risk factors and preferences.