Is it possible to update an iPad that is 10 yrs old?
Is it possible to update a 10 yr. old iPad?
No.
Sorry.
Your iPad is too old for any upgrades/updates.
Sorry.
If you need/want an iPad with an up to date iPadOS with access to current, updated apps, then you really need to seriously consider a new iPad model OR a much, MUCH “newer” and less expensive, used iPad models, from better known, trusted Apple product/device retailers/resellers, capable of running the latest iPadOS versions.
There are plenty of newer, older iPad models that can run the latest, current versions of iPadOS.
Sorry & Best of Luck to You!