The zone you put in has no purpose whatsoever, to be honest.
A more important question is the difference between Silver and Gold. Silver is free and lets you use the marketplace and other similar functions. Gold lets you play online in games, and is about 50 bucks a year (which is 4 dollars a month).
Age doesn't really affect anything, and I don't remember ever putting in an age... you'll want to ]
I knew the silver/gold difference.
When I was just going through the registration, when I got to the part with name state age and that stuff it already put my age in for me and wouldn't let me change it from what I had in my hotmail account (and the age was wrong on that
)