Apple could wipe out nearly 200,000 apps from its App Store with iOS 11
64-bit processors were first introduced by Cupertino with the iPhone 5s, but the company only started demanding 64-bit support from developers in June of 2015. Thus, the actual number of apps made obsolete might actually be far greater than the analytics firm estimates, as Sensor Tower only included titles which were submitted prior to September 2013 and have not been updated ever since.
Still, we can't say what will happen for sure until Cupertino previews iOS 11 at WWDC in June. Although the big annual update to the operating system seems like a very convenient occasion to remove support for 32 bit applications, ultimately it's up to Apple to decide when to pull the trigger.
source: Sensor Tower via AppleInsider