Answer To Why Wont My iPod Update to iOS 7?

The question that my friend asked me was :

My iPod is a 4th generation iPod touch so it should have updated, I was waiting to get that update. Please help.

The 4th Generation iPod Touch does not support iOS 7. The highest it will ever run is the previous iOS 6.1.3.  The 4th iPod Touch still has a decent resale value, although it will only decrease with time.