Starting August 1, 2019:

All new apps and app updates are required to provide 64-bit versions of any 32-bit native code they provide.
Extension: Google Play will continue to accept 32-bit only updates to existing games that use Unity 5.6 or older until August 2021.
Starting August 1, 2021:

Google Play will stop serving apps without 64-bit versions on 64-bit capable devices, meaning they will no longer be available in the Play Store on those devices.
This will include games built with Unity 5.6 or older.
 
 
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