Many girls start their period younger or older then 12 years of age. it all depends upon their hormones.
12 is the perfect age to get your period 12 is the most normal age to get it
The total period is 12 months.
12
Group number 12, period number 4 Transition metal
No element in period 3 has an atomic mass of 12.
a 12 month period is called a fiscal year, there is also a natural year.
when she was 12
12
There are 12 decades in a 120 year period.
It is very possible you will have your period at a similar age as your siblings,but not certain...so you cuold ave it at 12 if your sister did,or you could have it a little later.
The odds are 91% that any given 12-year period will include three leap years. The other 9% of the time there are two leap years in a 12-year period. There are never four leap years in a 12-year period.
Jupiter's orbital period is 12 Earth years.