Short answer: Most guidelines suggest starting average-risk screening at age 40, with options to start earlier if you have higher risk factors or specific family/genetic history. How/when to start can depend on your personal risk and local guidelines, so it’s best to confirm with your healthcare provider. Details to consider

• Average-risk individuals: Common recommendations advise a mammogram every 1–2 years starting around age 40, continuing as long as you are in good health and expected to live many more years. Some organizations emphasize biennial screening from 40–74; others offer annual options or different schedules. If you’re 40–74 and at average risk, discuss the interval (annual vs every 2 years) with your clinician.
• Younger or higher-risk individuals: People with a strong family history, known genetic mutations (e.g., BRCA1/BRCA2), prior chest radiation, or certain benign breast conditions may begin screening earlier or use additional imaging such as MRI. Some guidelines suggest risk assessment in your 20s or 30s if risk factors are present.
• Dense breasts: If your breasts are dense, you and your provider might discuss supplemental imaging options or more frequent monitoring, as density can affect mammogram sensitivity.
• Shared decision-making: Given differences in guidelines (USPSTF, ACS, radiology societies) and personal risk factors, many clinicians emphasize choosing a starting age and screening interval in collaboration with your healthcare provider.

What to do next

• Check your personal risk: Consider family history, genetic testing results, prior chest radiation, or known high-risk conditions. If any apply, ask about an earlier start or supplemental screening.
• Talk to your primary care physician or a gynecologist: They can assess risk and tailor a plan, including timing and imaging type (2D vs 3D mammography).
• If you have symptoms or notice changes, don’t wait: any new lump, skin changes, nipple discharge, or persistent pain warrants evaluation today.

If you’d like, share your age, family history, and any known risk factors, and I can outline a more personalized starting point based on common guidelines.