The American Cancer Society recommends:
Women should discuss their individual cases with their doctor since risk factors need to be identified and factored into screening schedules. Women with risk factors such as breast cancer in first degree relatives and/or known breast cancer genes in the family need to discuss screening with their doctor before the age of 40. Your risk of breast cancer increases as you age, so a regular mammogram is especially important if you are over 50. If you think you need a mammogram, don’t wait for your yearly physical. Contact your health care provider right away.