５０ごじゅう代だい

noun

one's 50s; fifties

Refers to the age range from 50 to 59, or to people in that age group.

• 父ちちは５０代だいで会かい社しゃを辞やめた。

  My father quit his job in his fifties.

• ５０代だいの女じょ性せいに人にん気きの趣しゅ味みは何なんですか。

  What hobbies are popular among women in their fifties?