弱冠

From the Book of Rites, Book 1 (《禮記·曲禮上》):

人生十年曰幼，學。二十曰弱，冠。三十曰壯，有室。……百年曰期，頤。 [Traditional Chinese poetry, trad.]

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人生十年曰幼，学。二十曰弱，冠。三十曰壮，有室。……百年曰期，颐。 [Traditional Chinese poetry, simp.]

From: The Book of Rites, c. 4^th – 2^nd century BCE, translated based on James Legge's version

Rén shēng shí nián yuē yòu, xué. Èrshí yuē ruò, guàn. Sānshí yuē zhuàng, yǒu shì....... Bǎinián yuē qī, yí. [Pinyin]

When one is ten years old, we call him a boy; he goes (out) to school. When he is twenty, we call him a youth; he is capped. When he is thirty, we say, 'He is at his maturity;' he has a wife. […] At a hundred, he is called a centenarian, and has to be fed.

弱冠

1. (literary) the approach of adulthood (20 years of age)

From Literary Chinese. From 禮記/曲禮上.^[1]

• (Tokyo) じゃっかん [jàkkáń] (Heiban – [0])^[1][2][3]
• IPA^(key): [d͡ʑa̠k̚kã̠ɴ]

弱(じゃっ)冠(かん) • (jakkan) ^{←じやくくわん (zyakukwan)?}

1. 20 years of age
2. youth

弱冠 • (yakgwan) (hangeul 약관)

1. hanja form^? of 약관 (“20 years of age”)