come of age

/K AH1 M AH1 V EY1 JH/
verb
  1. 1

    To reach a specific age where one is legally considered to be an adult.

  2. 2

    To mature, or become fully developed.

    โ€œWikipedia has come of age and is the first place to look for information.โ€

Source: https://en.wiktionary.org/wiki/come%20of%20age