20 years old
The age of twenty; culturally significant as the age of adulthood in Japan (coming-of-age).
He will turn 20 this year.
Once you turn 20, you can drink alcohol.
Only when written 二十 / 廿
Archaic reading for the number twenty; restricted to the kanji forms 二十 and 廿. In modern Japanese, にじゅう is used.
In classical texts, 二十 can be read as はたち.
My younger brother is turning twenty next month.
My friend celebrated her 20th birthday, and we all had a party for her.
This alcohol cannot be sold to people under twenty.
I feel like my way of thinking changed a bit after I turned twenty.
二十歳 (はたち) is the special reading used for a person's age of twenty, while 二十 (にじゅう) is the ordinary reading for the number twenty in all other contexts.
二十日 (はつか) means the 20th day of a month or a 20-day duration, while 二十歳 (はたち) means '20 years old'; both use an irregular reading of 二十 but refer to completely different things.
Arabic numeral spelling; common in informal writing and forms.
Simplified kanji 才 for 歳; often used for ages in casual contexts.
Archaic spelling for the number twenty; restricted to the archaic sense.
Archaic single-character spelling for twenty.