成せい年ねん

noun

adulthood; legal age; majority

Refers to the age at which a person is legally recognized as an adult. In Japan, this was lowered from 20 to 18 in 2022. Often used in legal and formal contexts.

• 日本にほんでは2022年ねんから成せい年ねん年ねん齢れいが18歳さいになりました。

  In Japan, the age of majority became 18 in 2022.

• 成せい年ねんに達たっすると、親おやの同どう意いなしで契けい約やくできます。

  Upon reaching adulthood, you can enter into contracts without parental consent.