<p><strong>Noun</strong></p><ul><li>A cardinal number, ten times six.</li><li>A symbol for this number, as 60 or LX.</li><li>A set of this many persons or things.</li><li>Sixties: The numbers, years, degrees, or the like, from 60 through 69, as in referring to numbered streets, indicating the years of a lifetime or of a century, or noting degrees of temperature.</li><li>Example: Her grandfather is in his late sixties.</li><li>Example: The temperature is in the low sixties.</li></ul>