Photoshop as with any software gets updated on a regular basis so they can run on the ever evolving hardware and operating systems.
You need to check the minimum system requirements for each new version which can be found here.
https://helpx.adobe.com/photoshop/system-requirements.html
So you need to update your hardware if you want to continue upgrading your software.
I just spent €1800 on a new PC to replace my aging 9 year old system, the old PC runs fine at the moment but I know it might not be able to run newer versions of software going forward and that's mainly due to the i7 3770K CPU and the motherboard, the GPU is a RTX2060 Super so that will go into my new PC.