I was about 11 or 12 at a friends house. I didn't have an xbox yet so I was really excited every time I went over because I knew we'd play Halo!. The good memories are still there though. You?
EDIT: Don't forget to tell of the first experience or memories!
[Edited on 04.27.2010 5:19 AM PDT]
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I was eight, played it at my uncle's/grandma's house. I was convinced it was the greatest thing ever, even though I barely knew how to play it.