Can a14 year old her breast cancer?

Very very rare: one case was reported in 6 yr old , age is no exception to cancer .

Yes but it's rare: Breast cancer can affect women at any age although is's rare for a 14 yeay old. About 7% of women with breast cancer are under 40 years old. The youngest person documented was about 3 years old. There are certain conditions that places a woman at high risk eg personal hisrory, strong family history (mother, sister etc), brca1/brca2 mutation etc. If you have a breast mass you should see your doctor