及笄

jíjī
to reach marriageable age (a girl's fifteenth birthday)

CEDICT

to reach marriageable age (of girls who have just turned fifteen)

Wiktionary

笄，髮簪。古代女子年满十五岁而束髮加笄，表示成年。后世遂称女子适婚年龄为「及笄」。

重編國語辭典

Entry Composition

1 及 jí
  1. and
  2. to reach
  3. up to
  4. in time for
2 笄 jī
  1. 15 years old
  2. hairpin for bun