Can I delete old versions of libreOffice after updating newer version?

I have older versions on my pc

I assume you are using Windows? I’d guess that you are talking about either the downloaded installation .exe file, or the folder of program files etc that is created when you run the installation .exe file and left when installation is complete. You can safely delete the folders relating to earlier versions of LO.

Agreed. But it may be safe to keep the most recent install file, just in case the upgrade messes up something that’s important for you so that you want to continue with the older version.

Thanks so much. I have had good service from LIBREOffice.