Is there a version limitation in the terms of operating systems for the vst3 and au that we create with JUCE?

I see many plugins have many different problems in different operating systems.
So is there a certain version level that won’t be able to run VST3 and AU plugins ? Windows 10, 8,7, xp,… or Mac Catalina,Mojave,High Sierra?

Is there an operating system version that JUCE plugins cannot work in it? I am trying to find out the parameters that play role in this topic, so that I can ask my customers to upgrade their systems to that particular one or I can warn them and if their systems cannot run the plugin, they don’t download it.

I know it depends on many many different things but I need your thoughts to define my target operating system versions.

Thanks in advance