|Origin:||sixtig, from six 'six'|
the number 60:
sixty years ago
2 [plural] also the '60s, the 1960sTMC
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
to be aged between 60 and 69
I'd say she was in her late 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