Why do JLPT N5 learners confuse 二十歳 with 二十日?

Both words occupy adjacent semantic territory, which is exactly why the JLPT uses them as distractors for each other on multiple-choice items. The fastest way to stop confusing them is to study them as a pair, write a one-sentence contrast in your own words, and drill the pair specifically rather than each word in isolation.

Is 二十歳 or 二十日 more common on JLPT N5?

Both appear in the JLPT N5 curriculum and either may show up on a given exam. Don't try to predict which one the test will choose — learn to distinguish them and you'll be safe regardless. Both belong to the Daily Life Nouns theme of N5 vocabulary.

How do I practice this confusion pair?

Free option: visit /try and pick a confusion drill. Paid option: none — JLPT Mastery is free during launch. Whichever route you take, the engine specifically re-tests pairs you've gotten wrong rather than rotating through general vocabulary review.

JLPT N5 · Beginner · Meaning confusion

二十歳 vs 二十日

Q: What's the difference between 二十歳 and 二十日?

二十歳 (はたち) means "20 years old" and 二十日 (はつか) means "twenty days; 20th (of month)". These words share the "hata-" reading and the 二十 kanji. The confusion stems from distinguishing the specific suffixes for calendar days (~ka) versus age (~chi).

Why JLPT N5 learners mix up 二十歳 (はたち, “20 years old”) and 二十日 (はつか, “twenty days; 20th (of month)”).

二十歳

はたち

20 years old

noun

二十日

はつか

twenty days; 20th (of month)

noun

Theme: Daily Life NounsJLPT N5

Why these get confused

These words share the "hata-" reading and the 二十 kanji. The confusion stems from distinguishing the specific suffixes for calendar days (~ka) versus age (~chi).

How to tell them apart

Anchor on the meaning, not the form. 二十歳 (20 years old) and 二十日 (twenty days; 20th (of month)) live in adjacent semantic territory. Memorize the boundary, not just each word.
Shared kanji: 二, 十 appears in both. The other character is what changes the meaning — focus your attention there.
Read the example sentences below. Seeing each word in its natural context builds a faster lookup than studying the dictionary form alone.

In a sentence

二十歳 (20 years old)

妹は二十歳です。
二十歳になりました。

二十日 (twenty days; 20th (of month))

二十日に届きます。
一月二十日に会いましょう。

How JLPT tests this pair

On JLPT N5, this pair shows up as a vocabulary meaning question. You see one word and pick its English equivalent from four options — one of which will be the other word in this pair, chosen as a distractor precisely because of the overlap.

Sample item

「二十歳」の意味は？

A. 20 years old (correct)
B. twenty days; 20th (of month) (distractor)
C. (other plausible meaning)
D. (other plausible meaning)

Drill this pair until it sticks

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Practice N5 confusion pairs

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Frequently asked

二十歳 vs 二十日

Why JLPT N5 learners mix up 二十歳 (はたち, “20 years old”) and 二十日 (はつか, “twenty days; 20th (of month)”).

二十歳

はたち

20 years old

noun

二十日

はつか

twenty days; 20th (of month)

noun

Theme: Daily Life NounsJLPT N5

Why these get confused

These words share the "hata-" reading and the 二十 kanji. The confusion stems from distinguishing the specific suffixes for calendar days (~ka) versus age (~chi).

How to tell them apart

Anchor on the meaning, not the form. 二十歳 (20 years old) and 二十日 (twenty days; 20th (of month)) live in adjacent semantic territory. Memorize the boundary, not just each word.
Shared kanji: 二, 十 appears in both. The other character is what changes the meaning — focus your attention there.
Read the example sentences below. Seeing each word in its natural context builds a faster lookup than studying the dictionary form alone.