Nikolas
Created page with "== Puberty and menarche == Puberty is a period of transition from sexual immaturity to sexual maturity, during which both internal changes (to the gonads and adrenals) and external changes occur. In females, puberty usually begins in the age of 8 – 12, while in males, it usually begins in the age of 9 – 13. However, the timing of pubertal onset varies wildly among countries and ethnicities. Pubertal onset occurs earlier now than 20 years ago. === Internal changes =..."
