<p>Kitanai rōjin is what I have found about from your question.</p>
<p>It means dirty old man too if you want to translate.</p>

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2021-04-17T11:09:55.657Z
2021-04-17T11:09:55.657Z
Subbu Sharma
<p>Is there a casual/slang term in Japanese for an old geezer who's a hardcore otaku? I know terms like erojiji and such but there are more referred to old men who are just perverted in general, but what about perverted old otaku?</p>

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2021-04-17T12:39:20.900Z
Cross-posted to Japanese.SE: [Is おたくじじい a proper term to describe an old man who's into anime or is there another slang term for it?](https://japanese.stackexchange.com/q/86191/5464)
Aki Tanaka
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2021-04-18T05:28:59.833Z
Define old men. When does one becomes old? (sorry for being rhetoric). I can think of "[kimo-ota](https://www.wordsense.eu/kimoota/)" or kimochi-warui otaku which roughly translates to disgusting or filthy otaku. They are kind of dirty, unhygienic and unemployed people who are obsessive about anime. Although I don't know the correct term for "Perverted old otaku" in japanese but it may come under kimo-ota.
Fumikage Tokoyami
<japanese-language><terminology>
What is the Japanese term for an old man/grandpa who is into anime/is otaku?
# What is the Japanese term for an old man/grandpa who is into anime/is otaku?
Posted by: username_0 on 2021-04-17
Is there a casual/slang term in Japanese for an old geezer who's a hardcore otaku? I know terms like erojiji and such but there are more referred to old men who are just perverted in general, but what about perverted old otaku?
**Tags:** japanese-language terminology
> **Comments:**
> **username_1**: Cross-posted to Japanese.SE: [Is おたくじじい a proper term to describe an old man who's into anime or is there another slang term for it?](https://japanese.stackexchange.com/q/86191/5464)  
> **username_2**: Define old men. When does one becomes old? (sorry for being rhetoric). I can think of "[kimo-ota](https://www.wordsense.eu/kimoota/)" or kimochi-warui otaku which roughly translates to disgusting or filthy otaku. They are kind of dirty, unhygienic and unemployed people who are obsessive about anime. Although I don't know the correct term for "Perverted old otaku" in japanese but it may come under kimo-ota.  
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## 1 answers
### Answer by username_3 on 2021-04-17. Score: 2
Kitanai rōjin is what I have found about from your question.

It means dirty old man too if you want to translate.
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