| | Conditions & Treatments | Hormonal Disorders What causes an eight year old to start her period? It is very unlikely for an eight year old to start her period. The average age for a girl to start her period is 12. Hormonal Disorders - Related Articles RBC production is regulated by what hormone? How does a nervous impulse vary from hormone signal? Why Do People Get White Hair? How do the changes take place in puberty? What are normal globulin levels? What Are Indicators of Not Enough Estrogen? What stage during puberty will menstruation begin?
