six ‧ ty /ˈsɪksti/ BrE AmE number
[ Language: Old English ; Origin: sixtig , from six 'six' ]
1 . the number 60:
sixty years ago
2 . the sixties [plural] ( also the '60s, the 1960s ) the years from 1960 to 1969:
The book was written in the sixties.
the early/late sixties
the student riots in Paris in the late sixties
3 . be in your sixties to be aged between 60 and 69
early/mid/late sixties
I’d say she was in her late sixties.
4 . in the sixties if the temperature is in the sixties, it is between 60 degrees and 69 degrees
in the low/mid/high sixties
a fine spring day, with the temperatures in the low sixties
—sixtieth adjective , pronoun :
her sixtieth birthday