| I'm 21, too.  Didn't have a C64, though--my buddy had one, and I was always insanely jealous.  We'd play on it for hours.  My first computer was even older (I think), it was an IBM XT compatible with QD-DOS.  My dad took it from his work in '84 or '85, when I was 2 or 3.  I must have started being a nerd very young, because I wrote BASIC programs on it even back then. 
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