Sure it is and who knows; maybe she will always be flat chested but why is her body any of your business unless you are sexually involved with her?
Who cares. Having your period isn't something to be proud of, it sucks. Be happy for the time that you can live without it.
i agree with the above poster...be happy that you haven't gotten it yet. Also i must add that your breast size doesn't really have any effect on when you get your period. all that stuff comes kinda randomly...
Of course it is - I had my first period at age 8 but didn't get anything up top until I was 10. And a cousin of mine got big ones just after her 9th birthday but didn't get a period until she was 12. It's just body chemistry, genetics, and a bunch of shit I don't understand.