Google Pulls Plug On YouTube App Support For 2012-Era iOS Devices, Smart TVs And Blu-ray Players
"As we upgrade the YouTube Data API to bring more features, we'll begin shutting down the old version on April 20, 2015. This will result in the current YouTube app not working on certain device models from 2012 and older," Google states.
For those of you with a device running Google TV version 3 or 4, you can ensure that your YouTube app will continue to work by upgrading it. If you're unsure what Google TV version you have, go to Settings > Customer Support > Android Version and hope it doesn't say version 2 or earlier, as those won't be able to upgrade.
As for iOS devices, support is being pulled for second-generation Apple TV and older units. For the iPhone, iPad, and iPod touch, you'll need to have iOS 7 or later installed for the YouTube app to continue functioning.