https://wccftech.com/pokemon-go-will-stop-working-on-32-bit-iphones-and-ipads-with-the-next-update/

If you have an iPhone 5 or iPhone 5c then we have some bad news for you: Pokemon GO will drop support for all devices that can’t run iOS 11.

With the release of iOS 11, Apple made the harsh decision of dropping support for all 32-bit devices altogether. But that’s not all, Cupertino even started telling developers that they should start updating their apps to 64-bit or else. Now though, Niantic has jumped onboard Apple’s bandwagon and announced something similar. With the next Pokemon GO update, the game will cease to work on older devices that cannot run iOS 11. This includes every single 32-bit device from Apple there is, including the iPhone 5, iPhone 5c and more.