Twenties are often celebrated as a coming-of-age milestone in many cultures. Rites of passage ceremonies may occur during this age. In some African tribes, turning twenty can mark eligibility for marriage and community roles.

The age of twenty is often associated with significant legal rights and personal freedoms. Celebration of milestones such as high school graduation. [American] In the U.S., reaching twenty can signify leaving teenage years and entering adulthood.

Historically, twenty was often seen as a young adult ready to contribute to society. Ceremonies may honor one's transition into adult responsibilities. [Greek] Associated with military service eligibility in ancient times.

Seijin Shiki (Coming of Age Day) celebrates those who turn twenty. Ceremonial events are held nationwide to honor young adults. [Japanese] Signal formal entry into adulthood with traditional attire and celebrations.