6th-Gen iPod touch and Older
The iPod touch is somewhat of an outlier. Apple doesn’t update the iPod touch as often, which makes this pretty clear cut. The new 7th-generation iPod touch, which came out earlier in 2019, will naturally work fine with iOS 13. However, the 6th-gen model, which debuted all the way back in 2015, won’t work with iOS 13. You need one of the brand new iPod touches to take advantage of the latest iOS.