How to Say "Twenty Years Old" in Japanese

二十歳

The English phrase "twenty years old" is expressed in Japanese as 二十歳.

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The reading はたち stems from an ancient counting system where はた referred to a group of ten items.
Historically, 二十歳 marked the traditional transition to adulthood in Japan, celebrated with the 成人式 (Seijin no Hi) coming-of-age ceremony.
While the reading 二十歳 is often pronounced nijū-sai, the traditional and special reading is hatachi.

二十歳ぐらいなんじゃない？
I think that she is about twenty years old.
This sentence is useful for expressing an opinion about someone's age using 二十歳.
Tatoeba #11510689 by small_snow, translation #7058847 by AlanF_US
彼女は二十歳のときに最初の子供を産んだ。
She gave birth to her first child at twenty years old.
This sentence is useful for describing a life event that happened at the age of 二十歳.
Tatoeba #87648 by bunbuku, translation #316060 by CK
ローリーは二十歳だ。
Laurie is twenty years old.
This sentence is useful for stating a person's age with 二十歳.
Tatoeba #1771858 by mookeee, translation #1771846 by CN
わたしは二十歳です。
I am twenty years old.
彼は二十才です。
He is twenty years old.
オレは二十歳だぜ！
I'm twenty years old!
めでたく二十才になったよ！
I've happily turned twenty!
1 more sentence on Tatoeba

Ren and Himari are talking about a childhood friend's age.

蓮 Ren

彼はもう二十歳なの？
Kare wa mou hatachi nano?
Is he already twenty years old?
陽葵 Himari

うん、今年で二十歳だよ。
Un, kotoshi de hatachi da yo.
Yes, he turns twenty this year.
蓮 Ren

二十歳か、大人だね。
Hatachi ka, otona da ne.
Twenty years old, he's an adult now.
陽葵 Himari

本当に、早かったね。
Hontou ni, hayakatta ne.
Really, time flew by.

Sources

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