I also have a 2014-ish desktop. Over the years added an SSD and replaced the graphics card around 5 years ago.
I can still run most games on medium settings, even some new ones if they are properly optimized, but nothing crazy, 1080p.
I just started to feel that my rig is getting slower and even AA games become more demanding.
I fully support using hardware as long as possible to minimise e-waste and see no reason to upgrade a PC every 2-3 years.
Edit: typo