People of any age can get breast cancer, so why is screening not offered to anyone that has or is developing breasts?

Breast Cancer Now has said that:

8 out of 10 cases of breast cancer are diagnosed in women aged 50 and over.

1 in 4 of cases are diagnosed in women aged 75 and over.

Just over 10,000 women are diagnosed with breast cancer under the age of 50 every year in the UK. Of these, around 7,600 women will be in their 40s.

Around 2,400 women in the UK are diagnosed aged 39 or under, or just 4% of all cases.

Breast cancer in men is rare with just 400 new cases in the UK each year, compared to around 55,000 new cases in women.