How old are you when you get your first period?
Some girls start as early as 9 or 10, others not until they are 15 or 16. The average age for starting menstruation is 12.5 years of age. Your period will come when your body is ready. The age when your period starts is determined by your genes, which you inherited from your parents. Have a chat to mum and any aunts and ask them how old they were when they started their periods and this will give you an idea of when yours might start. Remember you also inherit genes from your dad's side of the family so ask aunties and cousins on that side of the family too.