noun, noun which may take the genitive case particle 'no'
minor; underage person; being under age
Refers either to a person who has not reached legal adulthood or to the state/category of being under age. Often used before の, as in 未成年の飲酒 or 未成年の子ども.
彼はまだ未成年なので、親の同意が必要だ。
He is still a minor, so parental consent is required.
Drinking by minors is prohibited by law.