Your IPod Touch and iPhone are too old to upgrade to iOS 10 or 11.
See this list of iOS 10/11 compatible devices.
iPhone
- iPhone X
- iPhone 8
- iPhone 8 Plus
- iPhone 7
- iPhone 7 Plus
- iPhone 6s
- iPhone 6s Plus
- iPhone 6
- iPhone 6 Plus
- iPhone SE
- iPhone 5s
IPod Touch
iPod touch
6th generation