This is how long Apple supports iPads for

Macworld
If you have an iPad already or are thinking of picking up an older one, maybe a refurbished iPad, you’ll want to know how long it will still be able to use the latest version of iPadOS.
Apple is usually excellent in this area, often keeping older generations of its products on the latest versions of the operating system or at least blessed with security updates to keep them safe. But there comes a time when the software on an iPad can no longer be updated to a secure version of iP