<P> The Monday of the third week of May is `` coming - of - age day '' . There has been a traditional coming of age ceremony since before Goryeo dynasty , but it has mostly disappeared . In the traditional way , when boys or girls were between the ages of fifteen and twenty , boys wore gat , a Korean traditional hat made of bamboo and horsehair , and girls did their hair in chignon with binyeo , a Korean traditional ornamental hairpin . Both of them wore hanbok , and wearing hanbok on the coming of age ceremony can be sometimes seen even now . </P>
when is coming of age day in korea
The Monday of the third week of May