How to Say 20 Years Old in Japanese Hiragana

“20 years old” in Japanese hiragana is はたち (hatachi, twenty years old). This special reading is worth memorizing because several expressions containing the number twenty have completely different readings.

The Direct Answer and Polite Form

The standard hiragana expression for “20 years old” is はたち (hatachi, twenty years old). In a complete polite sentence, write はたちです (hatachi desu, am or is 20 years old).

The same age is commonly written with kanji as 二十歳 (hatachi, twenty years old). The ending です (desu, polite copula) makes the expression suitable for introductions and polite conversation.

The age counter is 歳 (sai, years old). Although most ages combine a number with this counter, twenty has a traditional reading that must be learned as one unit. A regularized reading, にじゅっさい (nijussai, twenty years old), is also accepted.

If you only want to say twenty as a number, use 二十 (nijū, twenty). Do not use the age expression for quantities unrelated to age.

Cultural note: Twenty has traditionally been treated as an important life milestone in Japan, which helps explain why the distinct age word remains prominent. This linguistic tradition is separate from current legal definitions of adulthood.

Age, Dates, Years, and Era Expressions

The correct reading depends on whether you mean an age, a number, a duration, a date, an ordinal, or an era year.

Japanese	Romaji	English Meaning
はたち	hatachi	twenty years old; traditional hiragana reading
にじゅっさい	nijussai	twenty years old; regularized hiragana reading
二十歳	hatachi	twenty years old; traditional reading
二十歳	nijussai	twenty years old; regularized reading
二十歳です	hatachi desu	am or is 20 years old; polite expression
二十	nijū	twenty; the number
二十年	nijūnen	twenty years; year 20 after an era name
二十日	hatsuka	the twentieth day of the month; twenty days
二十番目	nijūbanme	twentieth in an ordered sequence
平成二十年	Heisei nijūnen	Heisei era year 20
令和二十年	Reiwa nijūnen	Reiwa era year 20

The difference between the words is meaningful. 二十年 (nijūnen, twenty years) describes a duration, while 二十日 (hatsuka, the twentieth day or twenty days) is used for calendar days or a period measured in days. An ordinal such as 二十番目 (nijūbanme, twentieth) requires another expression.

An era year puts the era name before the number. 平成二十年 (Heisei nijūnen, Heisei era year 20) follows the Heisei era system, while 令和二十年 (Reiwa nijūnen, Reiwa era year 20) demonstrates the same structure for the Reiwa era.

If an English form uses a “year era” field label, remember that Japanese uses era followed by year. You may also encounter English descriptions such as “year Heisei 20” or “year Reiwa 20,” but the Japanese word order remains unchanged.

Four Natural Example Sentences

Use the traditional age reading in ordinary introductions and birthday conversations. The example translation beneath each sentence shows the precise meaning in context.

私は二十歳です。 Watashi wa hatachi desu. I am 20 years old.

来月、二十歳になります。 Raigetsu, hatachi ni narimasu. I will turn 20 next month.

今日は妹の二十歳の誕生日です。 Kyō wa imōto no hatachi no tanjōbi desu. Today is my younger sister’s twentieth birthday.

彼はまだ二十歳ではありません。 Kare wa mada hatachi de wa arimasen. He is not 20 years old yet.

Notice that the subject can be omitted when it is already clear. In a birthday conversation, the context may tell the listener whose age is being discussed.

Common Mistakes

The biggest mistake is treating the regularized reading as incorrect. にじゅっさい (nijussai, twenty years old) is an accepted reading, while はたち (hatachi, twenty years old) is the traditional reading and the usual beginner answer.

Learners often make several other predictable errors:

Using the number alone for age. 二十 (nijū, twenty) expresses the number, but it does not independently mean “20 years old.”
Confusing age with a calendar date. はたち (hatachi, twenty years old) refers to age, whereas 二十日 (hatsuka, the twentieth day or twenty days) has a different reading and function.
Translating the age counter as “year.” 歳 (sai, years old) counts age. 年 (nen, year or years) counts calendar years or duration.
Using the age word for an ordinal. To express “twentieth” in a sequence, use an ordinal such as 二十番目 (nijūbanme, twentieth), not the age reading.
Memorizing only the kanji shape. Knowing the meaning is not enough if you cannot produce the correct reading during conversation or understand it in listening.

For broader guidance on building reliable kanji associations, see Easiest Way to Remember Kanji Without Guessing.

From Recognition to Confident Conversation

The fastest way to master this expression is to connect its spelling, sound, and conversational use. Read it aloud, place it in a complete sentence, and then change the subject or tense.

A simple review routine is:

Look at the English meaning and recall the Japanese expression.
Say the complete sentence aloud without reading the romaji.
Contrast age, duration, date, and ordinal meanings.
Write down whether an error involved meaning, reading, pronunciation, or sentence formation.
Repeat the troublesome expression in a new personal sentence.

Teachers have observed recurring mix-ups between visually similar kana, including ぬ (nu, hiragana syllable “nu”) and め (me, hiragana syllable “me”), as well as ね (ne, hiragana syllable “ne”) and れ (re, hiragana syllable “re”). One approach is to let the learner complete an utterance before offering feedback, then revisit difficult characters with kana cards.

Kind Japanese offers 25-minute one-on-one online lessons over LINE. A focused lesson can include a short warm-up, an age or birthday speaking task, targeted correction, and a learner-owned review note containing the expressions or questions that need more practice.

For additional speaking strategies, read Japanese Conversation Practice Online: Speak Naturally. When you are ready to practise your introduction with a live teacher, book a Free Trial Lesson over LINE.

FAQ

Is the regularized reading acceptable?

Yes. にじゅっさい (nijussai, twenty years old) is an accepted regularized reading, while はたち (hatachi, twenty years old) is the traditional reading commonly taught first. For a simple self-introduction, hatachi is a reliable default; learning nijussai also helps you recognize the alternative pronunciation when you hear it in speech.

How is age different from a date or duration?

Age twenty normally uses はたち (hatachi, twenty years old), while a duration uses 二十年 (nijūnen, twenty years) and a calendar date uses 二十日 (hatsuka, the twentieth day). These words share the number twenty, but their readings change with the counter and meaning, so memorizing them as complete expressions prevents confusion.

Do I need this reading for the JLPT?

Yes, recognizing はたち (hatachi, twenty years old) is useful beginner vocabulary for the JLPT and everyday life, especially in introductions, profiles, and birthday conversations. The JLPT evaluates language knowledge, reading, and listening rather than speaking, so use official materials for format practice and separate conversation practice for producing the expression naturally.