What happens when you have your period for 4 days and 10 years old?

A 10-year-old girl having their period for 4 days is not medically possible. The average age for a girl to start her period is 12-13 years old. If a 10-year-old girl is experiencing any vaginal bleeding, it's important to consult with a doctor or healthcare professional to determine the cause and receive proper medical attention.