I got my parents in their 70s to use Ubuntu for a few years now. All they use is a web browser and word processing application for .docx files. They used MS Word for years and I found Only Office has a similar UI and opens word docs.
At one point I gave them an older laptop running windows again and they hated it. They wanted Linux back.
If it was for me, I would support a FOSS alternative but, parents didn’t enjoy the Libreoffice experience.