Okay.
For a mammogram, the recommendation is for women over the age of 40. In some provinces, the recommendation is for women over 50.
For an ultrasound, there is no limit; it's for any age. If a woman is high-risk, she can have this test at any age, but for screening purposes, I think it should start after the age of 40. As for the frequency of having an ultrasound, I would recommend annual testing, but I can show you some papers from Europe that recommend having an ultrasound every six months, especially for a high-risk woman.