Short answer: Most guidelines now support starting mammogram screening at age 40 for people at average risk, with tests typically every 1–2 years depending on the organization, personal risk, and preferences. If you have risk factors, start earlier or tailor the plan with a clinician. Details to consider

• Average risk: Many major guidelines recommend beginning at age 40–44 and continuing with regular screening (often every 1–2 years) through at least age 74, with ongoing discussion about extending or modifying the interval based on health and risk [medical guideline summaries and major health organizations].
• Personal risk factors that might shift timing:
  • Family history of breast cancer in first-degree relatives
  • Known genetic mutations (BRCA1/BRCA2, etc.)
  • Personal chest radiation exposure, especially at a young age
  • Dense breast tissue or certain syndromes
  • Strong personal or family history of breast or ovarian cancer
• What to discuss with a clinician:
  • Your starting age for screening based on risk assessment
  • The modality of screening (digital mammography vs. 3D mammography/tomosynthesis)
  • Screening frequency (annually vs. every other year)
  • When to add clinical breast exams or supplemental imaging if indicated

Practical steps for you

• If you’re under 40 and have no high-risk factors, talk with your primary care provider or OB-GYN about when to start and whether a risk assessment is appropriate now.
• If you’re 40 or older, schedule a conversation about a personalized screening plan. Many people begin with a baseline mammogram around age 40 and then proceed with regular intervals.
• If you have symptoms (lumps, nipple changes, skin changes) or notice a change in your breast, seek evaluation promptly regardless of age.

If you’d like, share your age, family history, and any known risk factors, and a tailored starting age and screening interval can be suggested in more detail.