Period's not started - young age girls question

Question :

I am 15 years old and my periods have not started yet.  A'll my friends already have theirs,  so that is wrong with me ?

Answer . 

Nothing at all,  are just developing at a different you rate from your friends and that is perfectly normal .
Periods can start at any age between nine and 16 years,  so there is no need for to be concerned for at least anotheryear.  However you you should by now have experienced some changes,  such as developing a bust and the growh ofsome hair onyour body.  Do try and discussyour anxiety with your mother or an older women fnend.