It has been known for months now that Apple will officially stop supporting 32-bit apps with upcoming iOS 11, which is set to launch in the next few weeks. As of January, users started getting a message warning them that the 32-bit apps won't work and many developers have since been working on releasing the 64-bit version.
Some have already released, but according to latest information, a lot of apps are still only available for 32-bit iOS. In fact, 187,000 out of around 2.4 million apps in the App Store will stop working with iOS 11 and most of them are games.
Since iOS 11 will only support 64-bit iPhones and iPads, those apps will still be available for those with 32-bit iPhones.