Menarche indicates the onset of first menstruation . The average age of menarche is between 12 and 14 years. It may start as early as 10 years or as late as 17 years and still be within normal limits. It is a major sexual developmental milestone in a female. Menarche takes place in Sexual Maturity Rating or Tanners stage 4.
Puberty in girls starts with breast development (thelarche) any time between 8 and 13 year . This is followed by appearance of pubic hair (pubarche) and subsequently menstruation (menarche ), occurring at an average of 12.6 year (range 10-17 year). Some experts believe that the normal age of menarche is advancing to as early as 9 year in some populations. Menarche usually occurs after 2-2.5 yr of thelarche. Menstrual cycles are often irregular in the beginning.
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