the time of life between 20 and 30
"She decided to take a gap year during her twenties before settling down into her career."
plural of twenty
"She has been saving her twenties to buy a new car soon."
From or evoking the 21st through 30th years of a century (chiefly the 1920s).
"The jazz clubs and flapper dresses that defined the twenties have become iconic symbols of that era's rebellion."