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[[Jakob Øster]], a Danish physician who conducted school examinations, reported his findings on the examination of school-boys in [[Denmark]], where [[circumcision]] is rare.<ref name="Øster1968">{{OesterJ 1968}}</ref> Øster (1968) found that the incidence of fusion of the [[foreskin]] with the [[glans penis]] steadily declines with increasing age and foreskin retractability increases with age.<ref name="Øster1968"/> Kayaba et al. (1996) also investigated the development of foreskin retraction in boys from age 0 to age 15.5 Kayaba et al. also reported increasing retractability with increasing age. Kayaba et al. reported that about only 42 percent of boys aged 8-10 have fully retractile foreskin, but the percentage increases to 62.9 percent in boys aged 11-15.<ref name="kayaba1996" /> Imamura (1997) reported that 77 percent of boys aged 11-15 had retractile foreskin.<ref name="imamura1997" /> Thorvaldsen & Meyhoff (2005) conducted a survey of 4000 young men in [[Denmark]]. They reported that the mean age of first foreskin retraction is 10.4 years in [[Denmark]].<ref name="thorvaldsen2005">{{REFjournal

|url=httphttps://www.cirp.org/library/normal/thorvaldsen1/

The findings reported by Ko et al. are consistent with the findings reported by Øster (1968), by Kayaba et al. (1996), and by Thorvaldsen & Meyhoff (2005).

Boys are born with a non-retractile foreskin.<ref name="agarwal2005" /> The [[foreskin]] gradually becomes retractable over a variable period of time ranging from birth to 18 years or more.<ref name="Øster1968"/><ref name="Thorvaldsenthorvaldsen2005"/> There is no “right” age for the foreskin to become retractable. Non-retractile foreskin does not threaten health so no intervention is necessary. Many boys only develop a retractable foreskin after puberty. Education of concerned parents usually is the only action required.<ref>{{REFjournal