Yes.
Anyone
No it does not make your breasts hang.
She is running a marathon for Breast Cancer Awareness.
Normally only experienced during pregnancy or directly after the birth of a child.
Breast milk is a secretion and you do not get the infection through the breast milk. Though this can happen rarely. As anything is possible in biology.
Ill
if you run daily, Yes, or more
Anyone no matter what the age breast feeds if they want to.
I found my breast lump through self breast exams; then had a mammogram and ultrasound, then lumpectomy which confirmed breast cancer diagnosis.
The same way anyone else can get it...through open body to body contact with fliuds such as blood, semen, vaginal secretions and breast milk.
By combining a BSE with a mammography and clinical breast examination, a woman is offered the best opportunity for reducing chances of death from breast cancer through early detection. Close to 90% of breast cancers are found through a BSE.
This creates a tiny opening in the breast, through which bacteria can enter.