Hippie era, with 'The'

• The time of life between 60 and 70
• Decade when ZIP codes were introduced
• Number of fashion items in Mary Quant's era
• Decade with tie-dyed shirts and miniskirts
• "Flower power" period
• Great Society era, with "the"
• Era of liberalization

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 .

Wiktionary Word definitions in Wiktionary
alt. 1 (sixty English) 2 The decade of the 1860s, 1960s, etc. 3 The decade of one's life from age 60 through age 69. n. 1 (sixty English) 2 The decade of the 1860s, 1960s, etc. 3 The decade of one's life from age 60 through age 69.