I was 9 the first time I got my periodo.
I was 10 when I started my first cycle
I was 13, my birthday is in December and I had it on March
Everyone is a bit different when it comes to puberty and periods. The average age for beginning stages of puberty is 9 to 10 y.o.; the average age for menstruation/ 1st period is between 12 to 13 y.o. ~ give or take a year.