Sixties
Part of speech: noun
Definition: The decade of the 1860s, 1960s, etc. (but especially the 1960s) The decade of the 1960s. The decade of one's life from age 60 through age 69.
Example sentence: Millions of people die every day. Everyone's got to go sometime. I've came by this particular tumor honestly. If you smoke, which I did for many years very heavily with occasional interruption, and if you use alcohol, you make yourself a candidate for it in your sixties.
1960s
Part of speech: noun
Definition: The decade from 1960 to 1969. Also known as the 60s.
Example sentence: During the 1960s, I think, people forgot what emotions were supposed to be. And I don't think they've ever remembered.