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Puberty that starts before eight years in girls and nine years in boys is considered to be precocious puberty.
==Onset of sexual function==
Menstruation usually occurs at about 12.5 years of age, while first [[ejaculation ]] usually occurs at about 13 years of age.
If a [[foreskinned]] boy's [[foreskin]] has not become retractable prior to puberty, then it will almost certainly become retractable during puberty.<ref name="Øster1968">{{OesterJ 1968}}</ref> <ref name="kayaba1996">{{REFjournal
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* {{URLwikipedia|Puberty|Puberty}}
{{REF}}
[[Category:Education]]
[[Category:Foreskin anatomy]]
[[Category:Foreskinned life]]
[[Category:Male sexuality]]
[[Category:Physiology]]
[[Category:Teen]]