Breast Cancer Screening Should Start at Age 40, Canadian Cancer Society Says

A radiologist uses a magnifying glass to check mammograms for breast cancer in Los Angeles, on May 6, 2010. The Canadian Press/AP-Damian Dovarganes

The Canadian Cancer Society says all provinces and territories should lower the starting age for breast cancer screening to 40.

The current guideline set by a national task force says screening for people at average risk for breast cancer should start at age 50.