"Peace" time?

• The decade from 1960 to 1969
• Great Society era, with "the"
• Late decade
• Era of liberalization
• Hippie decade
• "The Help" era, with "The"
• "Flower Power" era

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1848 as the years of someone's life between 60 and 69; 1827 as the seventh decade of years in a given century. See sixty .

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sixty \Six"ty\, n.; pl. Sixties . The sum of six times ten; sixty units or objects. A symbol representing sixty units, as 60, lx., or LX.