How to Say “Decades” in Japanese

何十年
nanjūnen
The English phrase "decades" can be translated into Japanese as 何十年 (nanjūnen).
何十年 is used to refer to a period consisting of several ten-year intervals.

What does it mean word for word?

The word is composed of 何 (how many), 十 (ten) and 年 (years), literally meaning "how many ten-year periods".

Which one should you use?

While 何十年 is often used in questions or to express an indefinite large number, 数十年 is the standard way to state a specific but non-exact number of decades, such as "several decades".

How does it change in a sentence?

To emphasize a long duration, such as "for decades" or "for many decades," you can add the particle も to the end of the phrase to form 何十年も.

How do you pronounce it?

nanjūnen

Did you know?

  • The character 年 is an ideograph that originally depicted a person growing grain, symbolizing the cycle of a harvest year.
  • When writing 何十年 in a formal context, Japanese writers may use the kanji 幾 instead of 何 to express the same idea of 'several decades'.
  • In Japanese, the word 何 usually asks 'what', but in 何十年, it functions as an intensifier to mean 'many' or 'countless', even when the speaker is not asking a question.

Examples in context

  • 朝のメニューがかれこれ何十年と変わってない。
    The breakfast menu hasn't changed for decades.
    This sentence is useful for showing how to describe something that has remained unchanged for a long time using 何十年.
    Tatoeba #9650968 by Sim5634, translation #9667956 by CK
  • 彼は何十年もこの街に住んでいる。
    Kare wa nanjuunen mo kono machi ni sunde iru.
    He has lived in this town for decades.
  • 何十年もの間、この技術は使われていない。
    Nanjuunen mo no aida, kono gijutsu wa tsukawarete inai.
    This technology hasn't been used for decades.

Example conversation

Two friends are talking about a very old building in town.

  1. 陽葵 Himari

    あの古いビル、何十年もあそこにあるよね。
    Ano furui biru, nanjuunen mo asoko ni aru yo ne.
    That old building has been there for decades, hasn't it?
  2. 蓮 Ren

    そうだね。陽葵、あれはとても歴史があるよ。
    Sou da ne. Himari, are wa totemo rekishi ga aru yo.
    That's true. Himari, that building has a lot of history.
  3. 陽葵 Himari

    蓮君、壊されるのがもったいないね。
    Ren-kun, kowasareru no ga mottainai ne.
    Ren, it would be a waste to tear it down.
  4. 蓮 Ren

    本当に。大切に残すべきだと思う。
    Hontou ni. Taisetsu ni nokusu beki da to omou.
    I agree. I think we should preserve it carefully.

Sources

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Ryan Lester
Ryan LesterHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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