It's all in the question...for me I discovered this bountiful site of knowledge at 22 and wished I had discovered it at the youthful age of 14 or at the very latest 18.
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I discovered GAG when I was 19. I'm 22 going on 23... getting so old.
I wish I discovered it at 16 and spent my casual internet time here instead of the BS gaming forums. That was a total waste of brain cells.1