Get yourself measured and if you need a bra get one the correct size, if you don't need a bra don't get one simple .
yes, some girls start wearing them when they are 7
I would said ages 9-12 is when they should start wearing bras. It is a personal preference and what there parents think is appropriate.
you should start buying training ones at about really late third grade if needed but most girls start with training bras at really early 4th grade and transition to real bras about 6 weeks after you start wearing training bras and wear it every other day to get used to it.
8 years old becauuse they are padded
When your breasts start developing you should start wearing crop tops/training bras. Once you have developed large enough to fit into an A cup, you should wear a proper bra.
the age women tend to develope there breast is 12 years old
Just be open with her. Tell her that you are developing and that you think you should start wearing bras. You might be a little embarassed at first but then when you start wearing them its not ebarassing to talk about it.
no earlier than 14
You don't need to start wearing them if your flat.
the only way is to tell her or ask her when she first started to wear bras
Well, it depends. Lets say if you were 9, and you needed to start wearing bras. Start off with a training bra. Start off with those because they're more comfortable and not as tight as normal bras. If your 'things' are starting to grow earlier than people in school, that's alright. I'm the only one in my class that wears a bra ( 3rd, 4th, and 5th grade is when girls usually start changing ) but if you start of late, that's alright also. You will start to want to wear a bra near 5th-6th grade because in 6th you have to change for gym class and most girls wear them by then.
10