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To the new people on 4Chan: If you meet all the requirements of an Oldfag, you blend in with all of the Oldfags, you are an Oldfag.
Same goes for Agingfag.
These terms do not mean how long you've been on 4Chan, it means how well you fit with the mentality of 4Chan.
Of course you'll lose all credibility if you don't know simple shit like how long longcat is, but it's more about how well you fit in than how old you are.
Yes. It's highschool again.