４０よんじゅう年ねん代だいじ字FuriganaMeanings1nounthe 40s; the fortiesRefers to the decade, e.g. the 1940s, or a person's age in their forties. Context determines which meaning is intended.彼かれは４０年ねん代だいに生うまれた。He was born in the 40s.父ちちはもう４０年ねん代だいだ。My father is already in his forties.
