Q: I have the old ipod touch and it will not update to ios 7 which i need to download new apps and my ipod says that it has ios 6.1.6 and thats the latest update, so how do i download new apps?

The article below may help.

Install the latest compatible version of an app on an earlier version of iOS or OS X - Apple Support

Download the current versions to a computer or compatible iOS device, click here, and follow the instructions.

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You've received a couple of suggestions, but not the best solution: buy a new iPod Touch.

The newest version of iOS is not able to run on the older hardware in your iPod which is why you can't upgrade it. So, to prevent users from being puzzled over why software they have downloaded doesn't work unless they upgrade iOS, this will let them know they cannot upgrade further.