関係副詞whenについて
As the world becomes increasingly complex, the transition from child to adult in our society becomes increasingly nuanced. In the olden days, an ability to work in the fields signified adulthood. Intersetingly, the term "adolescent" did not start to be used until the fifteenth century, while the concept of the young adult did ont appear until much more recently, when the munber of older adults increased and could be used as a comparative base.
while the concept of the young adult did ont appear until much more recently, when the munber...の途中の文にあるwhenは関係副詞のwhenですか?
もしそうだった場合recentlyは時間の先行詞になる単語の1つということですか?
お礼
有難うございました＾＾