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my iPod just suddenly started to be frozen. maybe because its old but how do i fix it when it gets frozen.

http://support.apple.com/kb/ht1320 will show you how to reset a frozen iPod. It does go through all the models so you should find yours on here. I do not think that your iPod freezes because of age :). It could be the battery as well as the hard drive. let us know if it has any other symptoms. Good luck