noun
one's 60s; sixties
Refers to the age decade from 60 to 69. Often used with possessive or descriptive phrases.
父は６０代で退職した。
My father retired in his sixties.
６０代の女性が道を尋ねてきた。
A woman in her sixties asked me for directions.
６０歳 means exactly 60 years old, while ６０代 refers to the entire decade of one's 60s.
Compound of 六十 (sixty) and 代 (generation, era, age range).