sixties Definition

1. The period of time between one's sixtieth and seventieth birthdays.

Example: Jean must be in her sixties by now
Form: one's sixties
2a. The range of temperatures between sixty and seventy degrees;

Example: Temperatures reached the low sixties today
Form: the sixties
2b. The period of time between the sixtieth and seventieth years of a century. Also as adj.

Example: born in the 60s
Example: sixties flares
Form: the sixties