はたち二十歳hatachiはたち２０歳２０歳はたち廿hatachi
1.
The age at which a person is considered to have reached adulthood in many cultures, marking a transition from youth to full legal status and responsibilities.
2.
A specific point in time that signifies two complete decades of a person’s life.
3.
A term often associated with various cultural rituals or celebrations that acknowledge the milestone of reaching maturity.
Example:
彼女は二十歳だと言ったが、それは嘘だった。