What is Menarche?
{{no sources|date=July 2023}} '''Menarche''' is the first [[menstrual cycle]] for [[female]] human beings. It is the central event of female [[puberty]], as it signals the possibility of [[fertility]]. Girls experience menarche at different ages. The timing for menarche is influenced by female [[biology]], in addition to [[Genetics|genetic]] and [[Environment|environmental]] issues, particularly [[Nutrition|nutritional]] factors. The average age of menarche for the [[United States]] is near 12.5 years and 12.75 years for [[Canada]]. {{biology-stub}} [[Category:Female reproductive system]]