10 Oldest Surviving Documents Of Their Type. Writing things down is one of the most important innovations in human history. As well as being able to spread ideas accurately across distance and time, writing also provided the records needed for law to function.
In the United States, the average age for a girl to get her first period is 12. This does not mean that all girls start at the same age. A girl can start her period anytime between the ages of 8 and 15. Most of the time, the first period starts about 2 years after breasts first start to develop. If a girl has not had her first period by age 15, or if it has been more than 2 to 3 years since breast growth started, she should see a doctor.
The discharge of blood and tissue from the lining of your uterus is your menstrual period (also called your period). When will I start my period? Most girls start their periods between the ages of 12 years and 14 years, but some start earlier or later. How long do periods last? When you first start having your period, it may last only a few days. Your first few periods may be very light. You may only see a few spots of reddish brown blood. Anywhere from 2 to 7 days is normal.