At what age should women start receiving mammograms?

I AM UPSET ABOUT MAMMOGRAMS AT 50. I AM A BREAST CANCER SURVIVOR DIAGNOSIS AGE 45 STAGE 2. IF 50 WOULD HAD BEEN THE TARGET BACK THEN, FORGET ABOUT REMOVING BOTH MY BREAST , I WOULD BE DETECTED AT A VERY LATE STAGE OR WOULD NOT BE ALIVE AT ALL. IT TOOK 9 MONTHS BETWEEN MY MAMMOGRAM AND SURGERY. DUE TO ALL THESE OTHER EXAMS I HAD TO ENDURE.
PEOPLE WOMAN ARE DYING IN THEIR 30'S AND YOUNGER AND OLDER. MAMMOGRAMS SHOULD BE LEFT UP TO THE DOCTOR TO DECIDE WHAT IS THE NEXT STEP.
THERE WAS SUCH A BATTLE WITH HEALTH CARE NOW THIS. DOES THE MADNESS EVER STOP . INSURANCE SHOULD FIT EACH INDIVIDUAL MEDICAL HISTORY AND ITS PREVENTIVE CARE. STARTING MAMMOGRAMS AT 50 WOULD DELAY DIAGNOSIS, IF POSITIVE THE LONG PROCESS OVER TIME OF LABS, EXAMS, MORE TESTING , SURGERY AND CHEMOTHERAPY. I DON'T GET IT DO INSURANCE COMPANY THINK THEY WILL SAVE MONEY IN THE LONG RUN? OR WILL THEY GET IT WHEN A FAMILY MEMBER GETS DIAGNOSIS THEN IT HITS HOME.