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After all, a good number of people here didn't get into anime when they were young. I'm pretty much the minority, there. And, hell, I have an aversion to network television. Other than anime, I rarely watch TV.
At 15 I didn't really watch anime so I can't make that comparison. Think I must have been 17, but even then it didn't become my main form of entertainment until 2009-10.
I basically stopped watching from eight to ten, picked up at Angel Beats when I was eleven. Then I had my middle school watching craze, and it's died down since then.
It's not. 6 represents imperfection, and 7, perfection. This is why 7 is regarded as a lucky number, and 6 is (less so) regarded as unlucky. There's also 66 and 77 which are...hm...can't really remember. But if I recall, 666 and 777 symbolize complete imperfection and perfection, respectively.