Starting with Windows 10 2004, Microsoft changes the minimum hardware requirements for the device. This change only affects new PCs, not existing PCs from original equipment manufacturers.
According to the documentation (thanks tofor link), Microsoft will no longer provide 32-bit support on Windows 10. For now, Microsoft still allows users to purchase Windows 10 32-bit, and continue to get updates for their Windows implementations 32 existing bits. People with a 32-bit PC shouldn’t have a problem as long as their device is still usable.
According to Microsoft’s documentation on minimum hardware requirements for Windows 10 desktop editions, “Starting with Windows 10 version 2004, all new Windows 10 systems will need to use 64-bit versions and Microsoft will no longer release versions 32 bit for OEM distribution. This does not affect 32-bit systems that were made with earlier versions of Windows 10; Microsoft remains committed to providing functionality and security updates on these devices, including the continued availability of 32-bit media in non-OEM channels to support various update installation scenarios. ”
This is just the first step in what will likely be a long process of transforming Windows 10 into a 64-bit only product. Sources say Microsoft is expected to begin rolling out Windows 10 2004, the May 2020 update, on May 28.