1N-SING 成熟;发达 When something reaches an important stage of development and is accepted by a large number of people, you can refer to this as its coming of age . 成熟;发达
...postwar Germany's final coming-of-age as an independent sovereign state.
战后德国作为独立主权国家的最终成熟
2N-SING [with poss]成年 Someone's coming of age is the time when they become legally an adult. 成年