When we say how old we are we use 'jahre', i.e. 'Ich bin zwei Jahre alt.' So when do we ever use 'Jahren'?
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1Did you consult any grammar book/site? You should have found dative plural there. What’s your actual question?– CrissovCommented Feb 10, 2016 at 11:32
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1 Answer
You use "Jahren", when you put a preposition to it: "In zwei Jahren", "Nach fünf Jahren", "Vor neun Jahren". There is also an exception. When you talking about one year, you still use "Jahre": "In einem Jahr", "vor einem Jahr", "nach einem Jahr".
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2It's a grammar rule. "In fünf Jahre" sounds strange. "In fünf Jahren" sounds more comfortable. Some plural subjects ending with "e get also a "n" One more example "Die Umstände" -> "Nach diesen Umständen". Commented Feb 10, 2016 at 10:12
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You could also look up a declension table for "Jahr", like here: crodict.de/nomen/deutsch/Jahr.html Commented Feb 10, 2016 at 12:18
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2The preposition in requires dative, so you have to adjust the case accordingly.– ChieronCommented Feb 10, 2016 at 12:18