西洋のほとんどの国では若者は１８歳か２１歳で成人になる。

In most Western countries young people come of age at 18 or 21. - Tanaka Corpus

三条西家による歌学の継承は、三条西実枝のあと、本来は三条西公国が継ぐべきであったが、まだ幼かったため、三条西実枝の高弟細川幽斎が中継ぎとして古今伝授を受け、三条西公国の成人をまって伝えた。

After Saneki SANJONISHI, the study of waka by the House of Sanjonishi should have been inherited by Kinkuni SANJONISHI, but since he was still young, Yusai HOSOKAWA, a high disciple of Saneki SANJONISHI, received teachings in Kokinshu （Collection of Poems Ancient and Modern) as an intermediary, and Yusai passed it on to Kinkuni once he had reached the age of adulthood. - Wikipedia日英京都関連文書対訳コーパス

また、西南戦争中に成人男子が出征して西郷家は完全に女所帯となり、武村の屋敷が焼亡した後は鹿児島各地を転々としたが、雪篷は常に一家と苦患をともにし、その精神的支柱となった。

During the Seinan War, all the adult males went to the front, and the women had to protect the Saigo family; and after the residence of Takemura had been burnt down, they drifted from one place to another in Kagoshima; during such days Seppo kept following them sharing the pains and sorrows, and gave them emotional support. - Wikipedia日英京都関連文書対訳コーパス